Like Rob says, it varies. Sunday evening is a good time to start, most people go home after a busy weekend. I found the key to catch fish is to spod all day. Parti-mix is good and use and any old boilie. After a bit the fish will come into your swim and like me your only use one rod, wont have time to cast other one out. Parti-mix does cost,I used about 20kg. But I went to 'The Range' (shop) or try a pet shop and buy a bag of multi bird seed. 25kg for under a 10 quid. Boil the seed in a pan as soon as the water hits boiling point put it in a air tight tub. Fill up a 10 litre tub, then add a bottle of flavour, doesn't really matter which one. A few hours later it will be ready to use( best to leave it over night).
If you need anymore help just ask. Let me know how you get on.
Good luck. And slack lines.