I know that enemies,after being killed they reapear after a few days. Does anyone know how many days it takes for them to reapear.

It depends on the enemy. Usually smaller things like Dwarf Bulborbs take two-three days, larger things like Bulborbs might take four or five. Sometimes things like Creeping Chrysanthemums might come back the day after, but most enemies take at least a day. —Jimbo Jambo