8,735,843 for level 31
1000 xp on gen 1 --> 8,735,843 / 1000 / 60 = 145,6 hours
1030 xp on gen 2 --> 8,735,843 / 1030 / 60 = 141,4 hours
Each gen you save 4,2 hours if you are always on x1.
1450 xp on gen 16 --> 8,735,843 / 1450 / 60 = 100,4 hours
That means if you become gen 16, you save 45,2 hours in comparison to gen 1 if you want to make another generation or 8,735,843 xp. =P
(ALWAYS on x1)