Unfortunately it's very difficult to say.
It really depends on the specific written reason(s) for refusal.
Appeals can take quite some time to run their course.
Personally, I don't think your best strategy is to re-apply just yet, unless you can be very confident that the current reason(s) for refusal have been convincingly countered. If that really is the case, and you can convince the tribunal, then your appeal will stand a good chance to succeed.
