How long would it take to completionist play every game in every

A lot
I'm replaying yellow right now, doing the same things you listed and also training all the mons to have the same level of my starter.
With 10 hours of gameplay I'm currently about to face misty

Depends upon what you allow, really.

From what I've done...

Gen 1 is about 6 hours each.

Gen 2 is about 9 each.

Gen 3 is about 10 for Ru/Sa, 8 for FR/LG, and about 25 for Emerald.

Gen 4 is about 14 for D/P and again about 25 for Pl/HG/SS.

Gen 5 is about 25 for B/W and 30 for B2/W2.

Gen 6 is about 25 each.

Haven't actually done a Gen 7 run yet but it is maybe 30 so far.

In total, with a bit of luck and a LOT of efficiency that's about 606 hours including a 25% boost for time spent trading/transfer etc.

Of course, this is all assuming you don't pointlessly gimp yourself and allow all trading and transfer since you're going to NEED to do so anyway so there's no point in outlawing it if you can't do so wholesale.

Unless you specifically only care about capturing all those available and not all species that aren't events in which case... Why?

>>32941582
>Haven't actually done a Gen 7 run yet but it is maybe 30 so far.
Oh, just to clarify, I meant here that I haven't done a completion type run. I have played it and I can't imagine it taking much if any longer than most since Emerald.

>>32941567
Depends upon how you're playing. If you're efficient you could nearly complete almost two of them in Gen 1 in that much time. I've done it.

And I'm no speed runner and I don't bother with glitches in my efficiency runs so I'm certainly not the best at it.

>>32941567
The beginning of Gen 1 is really slow, though.

>>32941626

actually, what's dragging me is the training of all the shitmons i'm capturing along the way, but I can't help it, I like them all too much to let them rot in the boxes