How much bait for a day sesson?

Its been a long time since i have been on a day long fishing session in the Sea (been a lure/spinner guy for the last few years).
For a good 6-8 hour day, how much bait do you bring?

Il be going for dogs on one rod so need mackarel. I was thinking 4-5 fillets should do it.
On another rod il be going for flatties and whatever else takes Rag/squid. How many Rags/boxes of rags/squid would you normally get through?

For a session like that id bring two packs of mackerel,a box of lug/rag and four or five squid...that should be loads ....

1/2 box of squid 2 full mackerel, packet of sandeel, 2 to 3 large razor-claim, 1/2 dozen frozen peeler and a fork to dig 12 to 16 lug and rag you can always dig more if needed, also I always bring a fine net for prawn,spratt maybe sandeel if their around, any left over bait I bring home and freeze it can be used as groundbait at night for conger.