I thought you might like to compare a Bash Street Kids puzzle page I drew from the roughs to the published version. The photo of the version at the pencilled stage on my drawing board was taken on 10th August 2018. After inking and colouring it I emailed the art to the Beano offices on 13th August 2018.
The published version (below) appeared on 26th September 2018 in Beano No.3954.
A six week gap between deadline and
publication is the norm. Sometimes, in the case of specials and annuals,
the gap is many months! For example I'll soon be drawing a Keyhole
Kate page for The Dandy Annual 2022, which will be published in July 2021!
Weekly comics pages are drawn 6 to 8 weeks in advance. Annual pages between 9 and 12 months in advance! Obviously we have no way of knowing if any calamity will be affecting society by the time the material is published (as is currently happening with COVID-19) but I like to think that the Dandy/Beano universe exists separately from ours in an escapist world where the worst things never happen.
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