I think it is the same amount of time than with pac classic. The longevity of todays premium guts is very good with poly crosses.
Someone else told in this or similar thread that when using coFocus as a cross: It starts good. Then there is a phase of wilderness at hours 2-4. Then it is good again for many many hours.
Born 1978. Male 4.5 singels league player. PK Q5 295 with a leather grip + og, a dampener and some lead at 3/9