i replayed my last game and made this
7days +lv59 = 1850
need 16000 EXP to reach lv60(one more ancient knowledge would make it)
Since i didn't use pet dragon to dig for at least 50 fights, it's quiet possible to find the scroll in 150 chests. But i it's impossible to reach lv61 unless got mass(20-30?) ancient knowledge~~~