This is from one of the f/t information guides I came across hope it helps.

Thawing times.

Mice, Dwarf Hamsters, Gerbils:
Pinkies - smalls 1 hr thawing time.
Mediums - larges 2 hrs thawing time.

Rats, Guinea Pigs:
Pinkies - fuzzies 1 hr thawing time.
Pups - smalls 2 hrs thawing time.
Mediums - 4 hrs thawing time.
Larges - 4-6 hrs thawing time.

Rabbits, Pigs:
Pinkies - fuzzies 2 hrs thawing time (0.1 – 0.5 lbs).
Hoppers - 4 hrs thawing time (0.5 – 1.0 lbs).
Smalls - 6 hrs thawing time (1.0 – 2.0 lbs).
Mediums - 8 hrs thawing time (2.0 – 5.0 lbs).

The above time estimations are based on removing the prey from the freezer and immediately placing it at room temperature (72 f).