I am a male and would like to know if anyone has worn any of the products for an extended period of time or up to 8 hours
Yes I have. But It's probably not good for you. Only a few of the models are suitable for use whilst sitting.
I have worn them overnight in bed without problem.
I would not advise it. It will make your ass sore.
I’ve gone to bed with it in (midnight-ish) and left in until around 4am without an issue. I use Astroglide 5ml (injected) and Vaseline coating on the Aneros - it always comes out easy when I need to remove it and moves nicely when inserted.