How long does it usually take a metacarpal fracture to heal?

6-8 weeks. Generally speaking, most fractures heal within 6-8 weeks but limited and protected range of motion may be perfmitted under the supervision of a therapist.
4-6 weeks. Metacarpal fractures take about 4-6 weeks to heal, with proper casting or splinting. For simple fractures, patients are usually allowed to return to regular activity after 6-8 weeks.