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90 is more common, but in terms of being able to sell their Uber stock that difference doesn't matter much.

No. Standard time window is 90 days. Even that can be pretty short if you have to buy those options for companies with higher valuation.

As far as I know, Pinterest was the first company to give a sane amount of time to exercise options:

https://medium.com/@michaeldeangelo/unlocking-the-golden-han...

They give you 7 years to buy, so you don't get stuck with a huge tax bill between exercising the options and being able to sell shares.

Huh. Not in the US, but I get 7 years, which is pretty normal around here.

Where are you?

Ireland. Every options scheme I'm aware of allows years after options mature to exercise them. Quite surprised that it isn't the same in the US; I don't know why anyone would take the risk of exercising options in a private company while it's private.