Start checking temp around 2 hours with the expectation it might need an additional hour. It won't be done after 2 hours but it should be more than halfway there.
2013 Stumps Classic - Delivered 4/15/13
Large BGE - Rescued 2012
2010 WSM 22.5"
2010 Weber genesis gas grill
Rescued 22.5 Weber One-touch gold
BBQ Guru CyberQ
2011 Built UDS - Retired