How long does it take for a tarsal coalition surgery?

That depends on how serious your coalition is and whether it will be a resection or a fusion. Mine was a fusion and it took about an hour and a half. Fusion is more detailed than a resection. If you have tarsal coalition and you do NOT have Arthritis in your bones, I strongly suggest the surgery now because it WILL form arthritis which causes (a) more expensive surgery (b) surgery with a MUCH longer healing period and (c)youll feel so much better once its done and you are healed!