Do you see answer marked or unmarked below? Yeah, I thought so.
Marking answer takes me usually no more than 1-1,5 second. So I have 4,5 second until end of question, and about 3 second interval before new question. I have had more than enough time to click chat, make a screenshot, and close chat. I never chat during Q&A, it deconcentrates.
Please, stop dumb arguments, or I'll close this topic, before it turn into flamewar, leaving you without any way to save your face.
Having a signature is like keeping a gremlin.
Just don't overfeed it, don't make it wishy-washy and you'll be a good responsible Signature Keeper :]