Unfortunately yourrifle will have to dictate your regiment. I have rifles that shoot fine clean and other who do better after light fouling. Typically for hunting purposes I shoot a verifing group(basically to check my zero) and don't touch it till after the hunt is over.

I clean my bore completely after every normal range session, rarely shoot more then 20-30 shots from any one rifle per sessions so see no need to clean while on the range. If you are planning on a whole day with one rifle it may be worth it to pack your cleaning tools/supplies just in case accuracy fades as the shots/fouling adds up.