How long do these batteries last?

Don't mix batteries, it's just bad. You will get a good amount of run time with those Godzilla sized *Can'tSayThisOnTV*ers in the first link.
 
You'll probably kill yourself by mixing batteries.

Running two of the first one to power just an n64 alone would probably get you 8-9 hours, with a psone screen maybe 6-7.

And make sur you know how big those monsters are. A cm thick, 16 cm long, 6 cm wide, *Can'tSayThisOnTV* MAN!
 
I'm not mixing them I'm asking about them separately, if I were to get two of the first or two of the second. but snowpenguin answered my question
 
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