How long will it take to recover from both an endometrial ablation, biopsy and mirena (levonorgestrel) coil fitted?

See below: You should be fine within a few days.

Varies: Generally just some brief cramping but could last several days. The endometrial ablation produces the same symptoms. Usually motrin, aleve, (naproxen) or other non steroidal pain meds are the best and maybe local heat. You should report fever or unusual or foul smelling discharge. Otherwise, waiting it out is best. Good luck.