You may struggle to do a reval in 2 hours - assuming it is done properly! Three hours is more realistic as the TRE has to see a full start-up, taxi, take-off and departure. You will be struggling to do that much quicker than an hour - then there are all the other events (Departure, Arrival, EFATO, RTO, SE-ILS, SE-GA, NPA, SE-ldg, 3 normals/abnormal, 3 abnormal/emergencies). Even if you are really good you will not be doing that lot in an hour. Hope that helps.