[ams6110]

The advice I got was double the number, and increase the time unit. E.g. you think the project will take 2 weeks, estimate 4 months.

[crasshopper]

I've heard that as well. I dunno, doubling seems to have worked so far...

[jdimov]

Might as well estimate 8 years then, you'd probably still be right.. but is it still worth talking to you?