Whirlfloc timing for extended whirlpool?

[beesy]

Im doing an extended 30 minute hot rest/whirlpool at around 200F with my ipa and wondering when i should add whirlfloc? Im doing a 60 minute boil before the hot rest and most of the hops will be added during this 30 minute hot rest/whirlpool period. Im leaning to close to the end of the actual boil, like around 10 minutes as i usually do, but wanted so see if anyone had any insight. Thanks.

 

[badbrew]

I'm curious what bittering effect that will have on the hops. BTW, I would assume the same with 10-15 on boil.

 

[dedhedjed]

At the brewery where I work we whirlpool hot for ten minutes then rest for twenty. We throw whirlfloc at the end of the boil. 10-15 min left in the boil will be fine.