How long does Floyd stay "retired"?

He will want to get to 50-0. He's gonna get one more fight next year and I think it's a rematch against Pacquiao. Floyd always liked his unbeaten numbers and the #50 is just too much of a temptation for him, he will want to have it. It would be a huge promotional tool for the rest of his life. "50 have tried, 50 have failed" etc.

he is a gambler so.. 1 year i guess.

He's got too big an ego to come back. He feels his body aging and he knows father time is knocking. He would rather go without the money than risk losing.

September of 2016. Pacquiao II.

None of the above, or less than 6 months. Just like last time.

He isn't retiring, he wouldn't know what to do with himself.

About 3-4 hours

Not long at all. I expect to see him back before the end of 2016.

Floyd Mayweather will be 39 years old come February 2016, and has already faced every fighter from his era. He's got tons of money in the bank, a solid promotional company (with some budding talents on the rise), a successful boxing gym, and he's crossed over to the mainstream as a personality. Floyd's not coming back and, frankly, I don't blame him.