You guessed it: you will need a lot of hours to beat every FF. But maybe not as many as you would think.
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According to Howlongtobeat and this post, 489 hours, not including any spinsoffs, sequels or the two MMO's (FFXI and FFXIV).
That means, 1 to 16 + 7 Remake, excluding X-2, XIII-2, Lightning Returns, XI and XIV.
I"ve actually been running through all main games myself, but doing Platinum runs on each, including the sequels (Excluding XI and XIV).
I have played through them all countless times thou, and in remasters where I could speed up combat and exp gain, I've used it.
Took me around 1100 hours on fresh account, but now I'm exhausted and super ready for Rebirth.
At this stage good luck you're better off picking a entry point and sticking with that