I was taught it takes about a quarter of the time to estimate work so if you think it will take 1 day you should have spent 1/4 day estimating. If you think 4 w

I was taught it takes about a quarter of the time to estimate work so if you think it will take 1 day you should have spent 1/4 day estimating. If you think 4 weeks then 1 week estimating. Whenever I’m asked to estimate I tell them that I’ll take a week to estimate a 4 week piece of work they almost always say don’t bother - then when the made up estimates are wrong we can discuss the fact that they didn’t bother estimating. It is a funny thing but works every time (in corps).