-Kill Thanos. 10-15 maybe, to kill Annihilation-era Thanos. current Thanos ... first kill Death
-Conquer Marvel Earth in a week at best. you/I would die of old age first. the number of Thors would be so high that they would not have sufficient physical space to position and attack without killing just simply hitting each other.
-Conquer Apokolips in day. dunno
-Defeat the combined forces of Monarch, SBP and SA Mangog dunno
-Defeat the entire GL Corps all at once and conquer OA in a day at best. don't they number in the thousands? I'd say 1 Thor could take maybe 2-3 fodder GLs or 1 brandname GL and 1 fodder GL, so .. maybe around 500 would suffice
-Conquer the entire Kree/Shi'ar realms in a month (due to size) at best too vast, plus there would need to be a Thor present on each planet or at least in the solar system, to maintain order ... would require 1000s imo
-Conquer DC Earth (no interference from the Presence, but the Spectre is at base non-amped power levels).
1 Thor and a battallion of fanboys 🙂
-Destroy Galactus and his heralds. infinite number required... Galactus would wipe them out faster than my machine would pump them out... also, he could just mindrape them and turn them into heralds 😐