In this scenerio it goes in stages and after each round thanos is rested and at full strength. After each round the amount of hulks facing Thanos doubles and keeps doubling.
Note: Regular hulks except in scenerio no. 3
1. First set of fights is without BFR
2. Second set of fights is with BFR
3. Against Savage Hulks with BFR
So the number of hulks essentially multiplies until Thanos loses? Well, that gives a whole new meaning to "Planet Hulk" by the time we get to round 40 or so.
Thanos could essentially also destroy the planet they were fighting on.
That's if you keep Thanos in character. If he went around indiscriminately popping planets while fighting innumerable Hulk's, one of the cosmic stiffs would notice and end the party.
1. First set of fights is without BFR - Anywhere between round 4-6
2.Second set of fights is with BFR - seeing how he do a veriety of things to bfr hulks i say hey can get to 32 easily but 64 is pretty rediculous...
3. Against Savage Hulks with BFR - maybe a harder time getting to round 6 maybe idk...