I have to admit, it doesn't happen all that often for me. I think the last time I was this broadsided by a fic is was when I wrote GTS, which was mostly finished in a single week, with only scenes here and there to finish after that. This last few days I honestly couldn't concentrate on anything else until I had Erik and Charles on the page rather than in my head. Apologies for everyone waiting for things from me, I have no excuses, just complete inability to control my creative urges for a few days.
If you get attacked all the time, I would love to hear your coping methods. If you are incredibly disciplined and can keep your muse in order, I would also love to hear about that :).
To start with, a little poll.
Are you ever attacked by rampaging plot bunnies?
How do you get rid of them?
What is the longest fic you've ever had to write and not stop until you were done? (link if you would like)