asking a question

[Anonymous]

is" twenty hours`sleeping" correct or "twenty hours sleeping"o.k.?

[Tdol]

I'd use the apostrophe with the noun sleep:

Twenty hours' sleep.

With sleeping it isn't necessary:
I spent twenty hours sleeping. :D

[MikeNewYork]

is" twenty hours`sleeping" correct or "twenty hours sleeping"o.k.?

I am going to dispute tradition in this case. Although it is considered as standard, I do not like the use of the possessive involving time or distance. "twenty hour's sleep" sets up the idea that the sleep belongs to the time. I would rephrase uses such as "two week's vacation" and "twenty hour's sleep" as "a two-week vacation" and "a twenty-hour sleep". That's just my personl preference.

[Tdol]

Two weeks' <typo>

[MikeNewYork]

You're right. See I told you I don't use it!