FF@20 Game Mode idea

Ever have like 30 minutes before work and want to play LoL but..don't have time to play LoL? Then FF@20 is for you!

Concept is very simple, a normal SR 5v5 game, but it's always ends at 20 minutes (or sooner). Basically, game starts out normal, plays normal, but at 20 minutes, the game calculates who is 'winning' and forces the other team to /ff yes

Now how does it calculate this? I was thinking a combination of Champion Mastery score, towers destroyed, dragons taken, total team kda, total team gold, and farthest pushed lane. (Heavily favoring a team that has damaged the enemy nexus, or if both have damaged nexi, whoever's nexus is at higher health, not auto-win for hitting nexus, if you're behind 30 kills, you'll still probably lose.)

Some problems with this-

It will heavily warp the META around early game power champions. -- ok? I'm fine with that. It could give some fairly unpopular champs a chance to shine and be more viable ( ), even if it is only in a special queue. If you're not ok with that..then do what 3v3's do- champion specific nerfs. Or buffs, especially to stacking champs like

Queue waiting time. -- I'd say have the queue ignore the normal "balanced" ELO matchmaking. Just throw anyone in queue together for the shortest possible queue waiting time. Let it be unbalanced. It'll possibly make for an even quicker game. If it's unbalanced enough, one team or the other may actually win in under 20minutes. The idea is for a quick match for when you don't have time to play a full match, so does it matter too much if you get stomped really hard?

The game may miscalculate who is winning. -- That I don't have much of an answer too. It'd suck if you were clearly ahead, but because 'math', you're forced to /ff and lose. But, again, it's a quick match you didn't invest a lot of time into.

Effecting normal SR queue times. -- This I kind of doubt. Idea is for a quick match for people who wouldn't normally play a match because they knew they didn't have enough time. It may even help with afking in normals, as some people will play a normal game when they didn't have enough time, and just leave when they have to do something irl. Sure there will probably be a flux of people who would play ff@20 just to try it out, but after a week, I'd say most would just play normals again unless they're on a tight time budget, leaving it where it should be, a way to play a quick game when you're unsure if you have enough time for a full game. (An hour+)

Other problems I haven't thought of? Reasons it wouldn't work?

Ideas or suggestions to improve the idea?