Seriously, when I don't consciously avoid it, MR sucks me in and uses up my time. It's nearly impossible for me to ask, get answered, and leave. What happens is this:
I do a search of MR to find an answer to a question. The search results lead me astray and use up a lot of time if I let them.
So I post a question, usually in a calibre subforum. Getting an answer is of burning importance to me. Of course while sticking around anxiously awaiting an expert's response, I start reading other people's posts, which leads to me posting a response in some of those threads. Now I have enabled myself to wait around for more reasons.
I notice somebody asked a question I actually know the answer to, which happens increasingly frequently as I learn more. And none of the experts has responded yet. And it's been almost an hour. So I respond. Then I second-guess myself and have to research and test things further, and find out I was right or wrong. If right, I feel good and am further enabled. If wrong, I vow to do better in future and try harder, and am further-enabled to spend more time here. In either case, I'd better stick around in case that OP needs some clarification….
Sometimes an expert rewards me with karma. Oh, I love karma!
And then I realize it's been 6 hours since I did anything I had on my list of things-to-do, except maybe get an answer to a question.
It's educational - that's my excuse.