Dunno if they adjusted but in the past, a while ago, story brought me rather to HM13.
For daily challenge you simply will need to have the max. lvl, which is 60 atm.
If the ever increase the max lvl again, you will need to lvl up before going for it. They fooled me once that way, I had prepared all to turn in after update, but tadaaaa, no way, get max lvl before thinking about 😃
PS: I just seen another post, it is HM12 with main story, for detail of time used you can read: