Sir Bahamut,you completely misunderstood the question.I hadnīt even talking about the speed of time compression.By activation of time compression I mean that all eras were already compressed at one point.It starts at 1000 .Letīs now suppose that someone has a clock in time compression(we consider all eras were already compressed at one point).That clock also marks years.When 500 years has passed on the clock the sorceress will finish Time Compression and the world will get back to normal.But time compression was infinitesimal all this years.At the year 1000 time gets compressed.1000 gets compressed with 500,2000,1300,1400,1450,700,etc...(all in the range of 500-2000).They get all compressed in an instant during the 500 years that passed on the clock.We suppose an absolute clock exists on the time compressed world.1000 is the era where the sorceress lives an performs TC.I beluieve I shouldnīt have mentioned 1500.To know that 500 years pass in a clock inside TC is enough.Forget about the "1500" date.It confuses things a lot.
Tc is activated at 1000 and 500 years pass on a clock inside Tc.Thatīs enough