TGM1 and TAP for the most part don't matter, because you can speed them up by holding down start. This holds true for TGM1 and TAP Normal/TGM+/Death/Doubles. The TAP Master one is close to 61.5 seconds long (at 60 fps), the invisible variant of which you must clear for a GM.
I'm not sure how long the TAP Death roll is without holding start, but I think it is approximately half as long as the TAP Master roll.
Just hold your 1p/2p start button during the credit roll and credits go super-speed. This only works in modes where the credit roll means nothing in terms of gameplay. Hence it doesn't work at all in TGM3, and won't work in TGM2 Master mode since the credit roll is part of the game proper.
You can see me fast forward the credit roll in this video. http://www.youtube.com/watch?v=57fd3zFuv78 Note that I still kept playing though.
