Depends on what your normal lengths are.

So for me/us 303 shooters if its known corrosive ammo its a flush with hot water down a funnel after shooting ie within 1 hour and spray some preserving oil or an oiled patch down the barrel and chamber right away. I then take it home and clean it that evening (if I dont clean it on the club veranda over a soft drink afterwards). If it isnt corrosive ammo I throw an oiled patch down it while still on the range or club and take it home and clean it that evening or sometimes the next morning. Cleaning consists of a patch wetted with a carbon only cleaning fluid then a clean, dry patch and repeat 2 or 3 times til it looks reasonably clean (I am not anal about it) and then an oiled patch, inspection and put it away. Oil would be Baristol, engine upper cylinder oil (hint it says it removes carbon) or even diesel.