so for the new season i did some math so you guys dont have to.
if you did the battle pass missions every day not missing the daily missions to, it would get you up to level 101 in the pass. from there youd have 20 levels remaining (if you want the rest of the lighters for a third fused legendary or the coins) the daily missions give you 1500 exp towards the pass per day meaning you need 4 days to get 1 level off them. if you bought the premium pass it would put you up to level 116 meaning youd only need 3 - 4 levels to get the rest of whats in the pass.
its done like this.
104 days resets every 7 days with 5 levels gained per week (a bonus level for every 4 days should you do the daily missions) and 15 weeks total. or if you want to do 104 divided by 7 it comes out to 14.857 weeks but i think its a little off.
if i missed anything let me know.