re: Aliens come and take away every man-made object. Humans maintain their current knowledge..

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I may overestimate humans, but we have historical evidence that you severely underestimate us.

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The historical evidence says it’ll take at least 150,000 yrs to get here.

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Humanity knows how to do all this already.

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You're conflating the entirety of human knowledge with the knowledge of any given individual. Just because something which was discovered by some person at some point doesn't mean everyone knows it nor knows it forever. I could walk through the Mall tomorrow and 8 or 9 out of every 10 people I asked likely wouldn't know how to create fire from friction or how to make a gill net.

And just because there are those who do, does not mean they have other skills which would be necessary to get humans back on track, like identifying ore veins in rocks, smelting that ore down into usable ingots, etc.

Along with that, I don't think you understand how much is involved in getting a dependable line of food set up, much less the time it takes to build even a basic shelter (like a lean-to or wikiup), to make basic weapons, to make basic tools, to chop enough wood to keep your fire going, to chop and shape wood to make a more secure shelter, to build a shelter with a fire pit that won't end up burning your shelter down, etc.

Starting with nothing more than a stick they just found on the ground, just getting to that level would take even experienced survivalists a good week or two and most people aren't experienced survivalists.

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Even if the clueless and useless die in short order, as a species, we would recreate this stuff on the macro level much quicker than a few hundred years.

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What do you mean "on a macro level"? There would be no macro level for quite a while. There are no roads, no bridges, no boats, no maps, no GPS, no communication beyond your immediate area; there's nothing. Along with that, the deaths which would follow such an event would be so astronomical as to leave humanity relegated to only smatterings of completely (or mainly) disconnected outposts throughout the world. It may be that the nearest person or group is a dozen miles away, but you won't know it until you have the luxury of enough time to roam that far (which you don't have if you are constantly hunting, foraging, cooking and chopping wood).

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Imagine the desire, knowing what we know is possible, to get back to the old ways. Motivation would be infinite.

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The only desire for a long time would be getting enough to eat, establishing a secure shelter, weaving and making some form of clothing, and creating and refining the tools focused on those ends. Memories of times gone by doesn't fill the belly, food does. It takes thousands of calories per day to keep a person in a survivalist scenario like this going and it takes many hours to forage, trap and/or hunt enough food (much less prep a fire and then cook the food) to meet that need with little more than a pointy stick.

I share the same perspective as the original poster. We would initially regress and then gradually advance back to the technology we have today.

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Well we went from no computers in the 1950s to 70 years later everyone has one in there hand and it calls people and take pictures.
So 70 years

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If you mean consumer computers for personal use, then yes. But the first electric computer was built in 1937. COBOL introduced in 1953 and FORTRAN in 1954. In 1890 a punch card system computer was invented to help the US government tabulate the 1890 census.

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Probably... the knowledge was the only thing that took time to attain... all the physical material already here

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There are no furnaces, no smelters, no hammers, no blades, no anything required to make the thousands of components required make the thousands of things that are precursors to finished components in an iPhone.

At least 1,000 years. Especially because after the first month people will shift from trying to make iPhones to just trying to survive. A year later groups will have been formed. Decades later cities. Centuries later civilizations.

If we even want to make iPhones again I think it is the time it took people to go from the Stone Age until now.

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It's a weird fantasy that people would go back to the stone age.

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With what fricking metal would we use to not go back to the Stone Age? Pure metal like copper or iron does not exist in nature.

We would 100% be back to the Stone Age for a few hundred years.

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Does your kid know how to make wire, magnets, and a lightbulb?

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The correct question is does his kid know how to find clean water, build fires, shape rocks, and hunt with a homemade spear better than most gun hunters can hunt today? If not, everything else is pointless.

Edit - This kid also needs to be fortunate enough to be in a good location when all this happens. Good weather, abundant natural resources, and few people to compete with at the time. And he still would need the above skills to survive.

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We would 100% be back to the Stone Age for a few hundred years.

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The estimated population at that time was somewhere between 1 million and 5 million people. So, if we figure that is what the world could sustain with that level of technology, we would be looking at a the survival rate between 0.0125% and 0.0625% of the current population. It’s a total reset, all relative knowledge to construct an iPhone is lost.