Not sure about hunts per level. I think in terms of hunter bucks at the highest level.
It can vary depending on software update. I was levelling up every 500,000 dollars or so in region 9 for a long time, then it was closer to every million. Since the region 10 update, it has been more frequent again.
Comments
85-90 I think. The only reward for a level is 1 gold, so if gold is what you're looking for, I would watch a few advertisements in the free gold area.
It can vary depending on software update. I was levelling up every 500,000 dollars or so in region 9 for a long time, then it was closer to every million. Since the region 10 update, it has been more frequent again.
iPhone 6, iOS 9.2
Was around 200 before reciently update. Seems like it takes 250-300 hunts 5o complete a level now.