Okay, I really don't understand. Doesn't the hospital give them vacation time as part of their benefits? Is it a money issue or a unit coverage issue?
Either way, I'm sorry, but I really really really don't think it's fair to ask people who've worked there forever to work extra hours (without overtime pay to boot) just so the new people can have a fun two weeks off in the summer! What a way to make the seasoned nurses resent these new people! It sounds kind of prissy to me, to be honest. Don't most hospitals give 2-3 weeks vacation per year to start with?
I understand if the staff has to pick up extra hours in the summer because a lot of people are taking vacation time, that happens everywhere. But to ask your unit to do it specifically for the new people isn't fair. If they don't have enough vacation time built up yet, when then that's life. We all had to go through that when we were first hired - waiting to get that first precious vacation time.
Sorry if I sound so heartless, but there is no way I would work overtime without overtime pay just because someone complained that they wanted more time off in the summer right after starting their job.
Then again, my unit has a very very low turnover rate, so we don't worry so much about "losing" new staff. Maybe that's why I'm thinking this way?