I'm not to sure exactly, but I broke my thumb 2 days ago and have been given a thumb splint to wear for the next 6 weeks. According to the doctors, if there are no complications it should be fixed by then. Fingers crossed though. I've just ad a broken tumb 6 1/2 weeks back... and im aloud to take it of tomorrow.so it would take 5 to 7 weeks to heal.iv'e just broken mine 4 hours ago, and have all this to look forward to!! Broke mine yesterday bummer. -I broke my thumb about 3 weeks ago and I can lift weights and all, the bad thing was that it was my dominate thumb. I had to learn to write with my left.bout 2 months to fully heal. To heal enough to stop hurting about 2 weeks.   ANSWER   It depends on the degree of injury made. Strong injuries might heal totally after … few months, while simple one might heal in a month.