Between 20 and 25 days. According to the official website Raiders of Dream of the Immortals, under normal circumstances, it can rise to level 70 in about 20 -25 days. At this time, you can obviously feel that the upgrade speed is getting slower and slower. It may not reach 1 level in one day, but it will reach level 2 in 3-4 days. In other words, for ordinary players, it takes almost two weeks to reach level 70.