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umm...as long as you're willing to go or until your tounge gets tired. raverboy
...this is just my perspective on the situation...
My range is 45 seconds to 4 hours. Pretty much until you gots ta go or get tired as Illusional said.
Heit ist mein taug.
Until you and your partner feel it is time to stop...
Life is a mystery...
Until you feel like going to bed...