> As a hiring manager, I would look at stuff that is less than 2 years as questionable. Especially if it is a repeated thing.

Ya, like I said, is still industry specific. Some its very common, some its still not. 2 years, does seem to be kind of a "magic number" though. Long enough that if you don't get a good bump in pay/promotion and are looking to move, you still gave that companuy the ole college try.

> If I see a resume where every single job is less than 18 months, then I start to wonder why someone can't stick it out.

Even then, if there is clear progression with each move (especially early career folks), I don't think most people will see that as not "sticking it out". If the applicant is switching jobs to advance in their career, I would go into an interview with the assumption that (a) they are working hard enough in their current role to earn that raise/promotion and (b) if there was room for them to move up into the next step at my company, they would be apt to take it if I was paying market rates for the advancement.

of course, if its all lateral moves and short term, that is a huge red flag for me as well.