Just a timeline of one reasonably healthy 60-year-old following double-valve surgery.
Day 3: chest drains removed
Day 4: main incision bandage removed
Day 5: main incision dry; no exudate
Day 19: chest drain sutures removed; partial dehiscence of chest drains
Day 21: chest drain exudate swabbed; no infection
Day 37: GP visit for chest drain wounds: "they look fine, secondary healing just takes a long time"
Day 39: a couple of spit sutures in the main incision removed during follow-up w/ surgeon
Day 44: chest drain wounds dry up; no more exudate
Day 52: chest drains healed over
Day 56: a couple more spit sutures pulled at home
I've been told none of this was particularly unusual, so if your healing seems rather drawn-out, you're not alone.
You might even get to:
Day 58: bored; writing a post on "OHS wound healing"