I checked the best history record of "Best Day" in Tibia Stats... it's the best exp gained in 24 hours, and the first place is:
1 Julandro [T] Celesta 268,721,212
I am really trying to figure out how he made it... but I just cant understand. In the best case with a blocker he will make 2kk exp / h, so let's say with double exp week he will make 4kk exp / h (which I think isn't really possible, but ok...), btw, he is 430 MS. Now 4kk exp / h * 24 is only 96kk exp.
Where are another 180kk exp????
Just can't understand it... Maybe it would be possible on preview server where you got double exp normally...