First thanks for all the work you've done on this so far, I completely love the historical aspect you can have with KSP.
I am up to the first Venera 1 flights (in stock to Eve), and you have the deadline as 70 days, which for a flight to Eve is pretty tight. I had a quick look at some of the older history space flight contract packs and their deadline is a more reasonable 5000 days, not saying this should be the deadline figure, but I think it needs to be increased somewhat.