Once the OP has confirmed a winner (after 24 hours since first post) anyone can post if it's OH - he never gave any time restriction other than the 24 hours...............
"Senior Pilot said (What Cockpit post # 1350 07/01/20) "Quite simply, you can post and discuss to your heart's content from the moment a challenge appears, but the declaration of a winner will not occur until 24 hours has elapsed. This applies to all three competition threads: a reference Wiki also covers the airfield thread.I would emphasise that all threads should respect that this is the Aviation History & Nostalgia forum with an expectation of historic images and/or subjects please."