Just transited through JED but on a through ticket. Should be enough time given the usual subjects IF you are assured to getting the onward flight BP in advance, and the QR flight is from the same terminal. Could be a long walk to the transit point (<1 mn wait last night at ~1830 but JED doesn't get busy until later) and then back to the connecting gate with boarding cut off times, etc. If you have to go landside, you're probably SoL. Just be sure you are eligible for VoA before you even try this.