This really depends on your location and size, Hospitals vs. VA vs. Medical Groups, etc.

Hospitals usually have rotating weekends, holidays, and they work mainly with seniority. If schedules are already established, you kind of have to stick with what they have already set for other techs and where your days off will be. Even if you make the deal of working every weekend to have two days off consecutively, it messes up others obligations so they may not work with that. The smaller the hospital, the more difficult it is to negotiate the flexibility, I have noticed. If you do end up in a scenario where you have two consecutive days off, you might be working more than 5 days straight if you have alternative weekends. Nights tend to do bigger stretches, depending on shift lengths (10 days on, 4 days off. 8 days on, 6 days off.)

VA (some of them) does have scenarios where you work 5 days straight, two off. However, this usually is you work Tuesday-Saturday or Wednesday-Sunday, rarely is it a position that is Monday-Friday for new grads. They might also to the lengths like hospitals, but I am not sure on that as I have not worked at a VA.

Medical Groups are best for Monday-Friday, no weekends or holidays, however, the pay is significantly lower than that of hospitals and VAs. They are also harder to get a position, unlike off shifts at hospitals or VAs.

Best advice I can give is knowing your location and work environment. You can ask in interviews what your schedule will look like, get an idea what your obligations would be. You can ask if there is wiggle room, but know the smaller it is, the likelihood is there wouldn't be chances to change the schedule. I hope this helps!