• 480 square inches per first mouse
• Plus 160 square in per each additional mouse
• Meaning four female mice would need 960 square inches minimum floor space

Uuggggghhhhh math is hardddd

• Source is German website badly translated

For my reference...

• 40 gallon - 2 mice
• 90 gallon - 3 mice (i think... I'm half asleep...)