OK, I joined yesterday (or perhaps the day before) :) I did a few tasks and then I got 2 tasks that BOINC said would be about a day each. BOINC showed a two day deadline which I thought was unreasonable because both of them would need to run almost perfectly to get finished in time.

I finally aborted one of them to make sure the remaining one would complete. Imagine my surprise that the YAFU website said I had a week for each...sigh. BOINC thinks 2 days and the project thinks a week.

OK, alpha project, but this seems to be a problem ;)

This is correct. The deadline is 2 days but you will get also credits if you return the workunit some days later.

OK. Now I know I can plan for BOINC "getting excited" with early deadlines. Are they necessary? I might suggest that the website agree with BOINC about the deadlines in any case unless this is your method of allowing late submissions in which case why not allow a week?

I want to have a fast turn arround, therefore a deadline of 2 days. But sometimes workunits are running long and therefer the late delivery credits. If I set deadline longer, Boinc will download to many workunits, starts the latest one shortly before the deadline and will not fit into the deadline if this workunit runs long.