It depends on a couple of things:
- Playing a lot more during holiday bonus periods
- or with stimpacks
- Prestiging 54 times:
- Level 1-15 is 1,045,000 XP each time
- If you are starting from scratch with no CO’s, that’s 18,810,000 XP to level all 18 current CO’s.
- A single Ascension level (after mastery 90) is 200,000 XP.
- So approximately 5 ascension levels worth of XP lost per prestige.
- 56,430,000 XP for 54 prestiges
- Also the lost “carry over” when reaching level 15 each time
- That’s 282 lost ascension levels; and 30,000 XP in change.
- Level 1-15 is 1,045,000 XP each time
- Mastery: Level 1 to 90 requires 18,467,500 XP
- 18,467,500 XP would get you 92 Ascension levels + 67,500 XP
- and ignoring the carry over loss from level 89 to 90
- Ascension: Level 90 to 1000 requires 182,000,000 XP
- Playing Co-op in multiple regions: since it’s not sync’ed, if you are playing in multiple regions, you can do the math for lost effort towards that goal; or how much you need to redo everything.
From scratch, all CO’s + all Prestiges + Mastery 90 + Ascension 1000:
((1_045_000 * 18) + # Level 1-15 for all 18 CO's
(1_045_000 * 54) + # 54 Prestiges
18_467_500 + # Mastery 1 to 90
((1000 - 90) * 200_000)) # Ascension 90 to 1000
= 275,707,500 XP
- 5569 games of Brutal on Random map with Bonus
- (not counting XP loss; mutations or daily XP bonus)
- 6126 games of Brutal on Random map no Bonus
And if you wanted to do it with just 1 CO (very boring) and no Prestiges, aka the minimum: 201,512,500 XP.
- Grinding only speedruns on specific map on brutal without bonus: 5037 games
(The sc2coop xp/games calculator allows only up to 8 digits, so either do that and multiply the ‘games needed’ answer by 10. Or work out <your xp goal> ÷ <how long you take per game>.)
The maniacal option: Get to mastery lvl 45-ish and use Artanis P3 to farm Cradle of Death on Brutal +6.
Imho, prioritise reaching mastery 90 since that gets you all the useful XP which can affect your game; not counting … this.