Day 1 without Mjolnir: Thor throws a remote at his brother.
Day 2 without Mjolnir: Thor throws his brother at some guards.
2 weeks without Mjolnir: Thor throws increasingly improbable items about desperately hoping to find one that returns to him. Utter destruction lies in his wake.
It occurs to me to add: Loki is actually very much like Mjolnir. Not only is he an effective projectile weapon, but no matter how far he strays, he’ll always come back to Thor.
Loki is the Philosopher King 