Will you be spodding/spombing over the top?if so and theres not many nuisance species,and a fair good head of tench i would leave it at least half hour maybe an hour,i generally cast more in the afternoon,that way i can introduce bait, without spooking any feeding fish,and change rigs etc,set the traps ready for the next feeding spell,id generally bait over the top with a spomb or 2 ,after each fish caught,or if i have no spomb ,just recast a loaded feeder every couple of minutes,just until i feel confident theres abit of bait on the bottom,
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