You can continue adding more and more operating systems to the USB drive until you have as many as you need or indeed you run out of space.
Ịnwere ike ịga n'ihu na-agbakwụnyekwuwanye sistemụ arụmọrụ na eriri USB ruo mgbe i nwere ọtụtụ ihe dị gị mkpa ma ọ bụ n'eziokwu ị na-agbapụ n'èzí.