This is a problem with a few devs to be honest. I won't bad mouth any of them though because some of them are new. I tried to advise one of the new ones not to provide 2 release dates for their next instalments but to instead focus on one instalment date at a time or they may face issues with back-tracking which annoys potential donators. I think that some people are a little eager though in comparing release dates with other avn's because you have some pump out work every week while others could take up to 6 months per release which probably aids their attempts at trying to provide a release date that's suitable. Personally, I've never done any work on avn's but I wouldn't provide a release date until I'm sure I can meet it regardless of the added pressure from others.