Also, certainly for state cases, a lot of appeal routes are not available unless you are actively in prison. Post-conviction relief, and federal habeas corpus are basically only available while you are locked in prison. If you do all your time in pre-trial detention, or your sentence is too short to fully complete your appeal then your conviction is stuck forever, even if you have meritorious claims. For instance, if your lawyer was drunk, high or not a real lawyer, there is no way to appeal that after you're released, you just have to live with the conviction for the rest of your life and all the collateral reduction in civil rights that comes with that until you die.