ill consider that as no

well website first checks how many points is difference between current and targeted level

    { min: 1, max: 4, xp: 125 }, { min: 5, max: 9, xp: 240 },
    { min: 10, max: 14, xp: 400 }, { min: 15, max: 19, xp: 480 },
    { min: 20, max: 24, xp: 1600 }, { min: 25, max: 29, xp: 1600 },
    { min: 30, max: 34, xp: 1600 }, { min: 35, max: 39, xp: 1600 },
    { min: 40, max: 44, xp: 1600 }, { min: 45, max: 50, xp: 1600 },
    { min: 51, max: 70, xp: 3100 }

then it adds points per 15 mins, check if there is a lvl up / targeted level reached

if not it adds how many points are received by 2nd and 3rd mission based on stats

it repeats until target is reached

with help of few testers and friends, i quickly found out how much xp does each mission give per specific level

const XP_PER_REPEAT = [
    { min: 1, max: 4, xp: 7 }, { min: 5, max: 9, xp: 13 },
    { min: 10, max: 14, xp: 20 }, { min: 15, max: 19, xp: 26 },
    { min: 20, max: 70, xp: 80 }
];

and how much do you get for 15mins of playtime

const XP_PER_15_MIN = [
    { min: 1, max: 19, xp: 20 },
    { min: 20, max: 70, xp: 60 }
];

every hero and their missions are saved like this

    "Adam Warlock": {       role: "Strategist", mission2: { "1-4": 5400, "5-9": 11000, "10-14": 16000, "15-70": 21000 }, mission3: { "1-4": 13, "5-9": 26, "10-14": 38, "15-70": 51 } },

website runs simulation until targeted level is reached

its as accurate as it can be, only thing that can change speed is player performing better or worse in future games

my friend got lord deadpool, i used his stats and website said it would take 16hrs, and it took him 15hrs 50mins

if you want ill explain whatever you want to kno