The bruising and pain levels seem realistic for a kick. The commenter above address the location and damage possibilities accurately. So long as it was a glancing blow, or through clothing/padding, you can avoid organ damage. Everyone's bruises heal at different rates, and often, it depends on how much initial bruising and where on the body. As someone with a variety of data on healing bruises, I can tell you that two weeks is a fairly long time span for minor bruising to still be evident. It's not out of the realm of possibility, though. You can hand wave the time a bit, by not giving an exact figure, or you could reduce it to a week and a half or so.