Technically, it doesn't take that long to actually leave Rabanastre. You have to hunt a mark for Tomaj by going to the Estersand, which means leaving Rabanastre. That happens pretty early in the game, I'd say an hour to 1 1/2 hours at most (for me).
If your talking about leaving Dalmasca, then that's a different story. It still didn't take me long because I also like to see what happens next in the story. I'd say 4 hours, tops.
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