How long a sebaceous cyst wound will heal? (cyst location : tailbone area) i've been undergoing daily dressing

Depends on size: Maybe a few weeks. Don't pack too tightly or this will prolong healing time.

Weeks: Sounds like you had a pilonidal cyst, which is a reoccurring infection/abscess over the tailbone. These take a long time to heal. Did you have surgery for excision of the cyst or was it just drained? If just drained you will need surgery to remove the cyst, otherwise it almost always comes back. Healing is delayed in this area and will take weeks, sometimes months, mainly because of sitting on it.

Unknown : Can take months to heal