I know, we should hold them in cold storage, etc, but I can't know for sure whether Bitfinex will credit the B2X on a 1:1 ratio for BTC holders.
Thank you for your answers!
Most exchanges will not credit you the same day but make you wait a certain amount of time. Your best bet is to withdraw and extract it yourself if you want 2x coins quickly.
There's no 2X fork anymore now, since it has been called off