Most vacation packages for software devs are unlimited or in the 3-4 week range. Plenty of time for a long vacation in the Spring and a shorter one in the fall. It's one of the only things that keeps me going through it all
In other words, you might be able to take a couple weeks in the spring - with some companies - and maybe a week during the autumn. Yet stories of folks getting vacation and not being able to actually use the vacation time abound.
It shouldn't be an issue to take all of your vacation time all at once if you should so choose.
