re: Would you take a few second glimpse at your life 30 years from now?

Would I be inside head for those 3 seconds? In other words, will I be able to understand context of the moment, know what I know at that moment, etc?

It's unlikely you'd see anything special in any random 3 seconds 30 years from now. I'd do it just to see I guess. I wouldn't if I was me for 3 seconds. I'd hate to find out one of my kids was in jail or dead or my wife was gone or something sad like that.