Best technique for sharpening mulching blades

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My technique is to try and glance them off a stone or concrete now and then while mowing.

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I use the flap disc on my grinder to sharpen the blade. Doesn’t take too much off, just make sure to keep the factory blade angle the same and don’t take more off of one side than the other.

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Vice + flat bastard

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Yup. Mine seem to get really dull every 2-3 weeks.
It must be the sand leveling I did. Also, I mow a lot.

Hand grinder with a grinding wheel. All of the comments are valuable so far. Keep them balanced as far as removing material from each side. The blades you have also make a difference. My original blades aren't as hard, strong, or thick as the second set I bought. They are like Gator's but a different brand, where the "teeth" on top face inward instead of outward. They are hefty and hold an edge for a long time. I used to sharpen my stock blades once per year, whereas these other ones I sharpen every two years, and even then they could probably go a third year.

I've never sharpened the blades on my mowers. I've replaced a couple of times but never sharpened them.

Although, I did sharpen the blade on my bush hog at my farm a couple of weeks ago. It was pretty dinged up. Had to do a few other things to it and thought while I was doing those, I might as well sharpen the blades.
I used my grinder with 60 grit pads.

I just do it with the grinder, takes maybe 10 minutes total to do both blades. Sharp to the touch. Remember eye protection.

I've yet to sharpen mine on my zero turn because I have this odd fear that my mower is going to fall on me while taking the blades off

Sharpen mine with a grinder 3 times a year.

Had an old baw tell me that even the little sticks you don't want to pick up with eat a blade. Hard for me to believe since a machete can cut all day and still be pretty sharp. But he has mowed more grass and sharpened more blades than I ever will even if I live 300 years.

I just use my Makita grinder I use to do prep work for painting house exteriors. I'll toss on a 50 grit disc and hit both sides of the blade to get a decent edge.

To check for balance, I have a framing nail driven in at a 90 degree angle to the face of a 4 x 4. When done sharpening I'll hang the blade by the center hole on that and make sure the blade is level left to right. If one side is lower than the other, just take off a little more metal until it is level when hung on the nail.