Very respectable time. Being fast is a good tool to work with but does not take priority over ball skills. Running with a sprained ankle is not healthy until it is fully recovered. I would tell the coach your still injured and sit-out. No shame in that. Don't worry about what the team think's. Let the team grow up. If your coach is good at what he does, he will understand give you time off. If trained properly your coach should help your rehab, tape and re-condition your ankle back to 100% strength. If your coach pushes you to play hurt. Say no and find another coach. Playing with injuries leads to other injuries. In addition to that if it is you 1st ankle sprain, you will find that with the right trainer your ankle will become stronger after healing than what it was before, due to un-used muscles and exercising. RICE, Rest, Ice, Compression and Elevation, rehabilitation exercises and strengthening/reinforcing.