I wrote some options today, and while calculating the annualized return, I got to wondering how others do it. I mean, do you split hairs, or is close good enough? For example I wrote some August positions today. so there are 25 days left until I have access to the money I had to put up to write them. So is it; option premium divided by margin requirement divided by number of days times 365? Or do many of you go, "Well, it's about three and a half weeks 'til expiration, so it's return divided by 3 and 1/2 times 52."? I realize the difference is very small, but I was just curious how others do it. Failure is not falling down, Failure is not getting back up.