Hi - football where i come from is a contact sport (rugby). From what i can see on TV, so is soccer!

3 weeks in plaster is the MINIMUM necessary to form a callous and get some strength in the leg. A bone needs about 6 weeks to heal properly.

Don't rush it because if you take a small knock to the shin, you could be out with an even worse fracture. Being fractured in 2 places also makes it worse...