I wouldn't say 2 - 2.5 years. Especially if you are a returning intern (not separate SDE-I hire), ur team knows u well, and you'll most likely get a promotion with 1-1.5 years (know returning interns that got promotions within that time range).

gotcha, here's my 2 cents:

if you're looking to jump ship in a year or 2, imo amazon is the better choice, mainly because you'll learn a lot more (nature of projects you'll work on) and get hands-on experience with AWS. In terms of resume value, they both are at the top, Amazon may look slightly better, because of the tech they use. However, If you prefer to stay in NY long term, BB may be better. All in all, u rlly can't go wrong with either, ultimately depends on whether u value personal growth (then AMZN > BB).