Without the bifrost and with Eren being hidden, MCU Thor most likely won't be able to kill all titans in just 4 days. There is just too many of them.
- The Founder acknowledges/knows that Thor exists and is at the bottom of the ocean(refuses to expose himself)
- Every single one of the Colossal Titans knows about Thor and is determined to get him out of the way/kill once in sight
- The Colossal Titans can't nuke of course due to already being transformed, but they can create explosions of steam and hot air like this (but they would only do this as a last resort/if they're dangered):
Now, OP gave the titans ability to defend themselves, but this doesn't matter. Thor is far too durable to be hurt by their punches, and the colossals have comparatively slow swings so they can't hit him anyway. He can also fly above them with Mjolnir, so they can't even touch him either way.
The problem is sheer fucking numbers of these things. Killing 10 million of them spread across the entire planet would require killing 104,166 titans per hour, or 29 titans per second without stopping. They can form a line 180,000 kilometers long, enough to circle the Earth almost 5 times. And crossing the whole planet while fighting, that's something Thor has never done. Or 180,000 if he kills them quickly one by one by throwing the Stormbreaker at their napes. Thor isn't that fast in combat, even with use of lightning.
Large aoe attacks like this one in IW where he killed a lot of Outriders at once...
...won't be as effective against wall titans due to spacing difference and resistance to overpressure force from aoe explosions and diffused force in general. In fact, attacks like these would kill only one to three wall titans at a time because all force is concentrated at one point and quickly dissipates with distance traveled, a.k.a lacks psi to destroy the napes further from the epicenter. And such attacks are too slow to kill 29 titans per second because they require charge-up. Killing titans requires high psi force concentrated at the nape, which is why throwing a Mjolnir or Stormbreaker at the napes like this:
...would be a lot more effective at killing titans if he throws it perpendicular to their formation and lets it cut the napes along the way. The issue is that even this still isn't fast enough to kill 29 titans per second, it doesn't even kill that many outriders per second and they are much smaller and closer together (it would have to cross 522-667 meters per second to do that to wall titans depending on titan width of 13 meters and spacing of 5-10 meters between titans, and Thor never uses it that fast in combat.)
That's another problem, Thor's combat speed isn't good enough for this. While he can travel very quickly by throwing his weapon in the air, he never fights at that rate. Stormbreaker can indeed travel at hypersonic speeds when summoned from around the planet and such, but Thor never fights that fast, and killing that many targets in 4 days requires significantly more speed than he has ever shown.
You're gonna need Captain Marvel to do it in time because she can fly at FTL and she can just go through the titans. Or Strange and Wanda to do some hax spell and punt them into another dimension. Thor ain't that fast.
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