LAS is a relatively senior base and all MD80 and 757 (until they phase it out). It has been stated that it will be the last Airbus base.

They don't update the seniority list often enough to know attrition but there are no retirements to speak of.

There are no overnights in LAS as has been stated repeatedly in prior threads. If you are asking about how many days trips are then I suggest you take an hour or two and read them. There is a lot you need to know.

Betting on upgrade times is risky. I was told 18 months and it took six years for me here. Too many moving parts to know that with any accuracy.

Best of luck whatever you decide.