Yeah it is something like 90 vials of pewter to get to that length.
As a narrator I have placed a few stockpiles of metals around the map, so my players can just grab them (some have consequences, if any of my players are reading...) In barracks, armories, certain nobles' houses, at places where they might be expected to have thugs around. There are "Bags of pewter beads" with a few hours of charges in them.
that's my two cents... as a narrator, I don't know what to do as a player. Start eating dinnerware?
Edit: Did the math again. It is 32 vials with 3 charges each, unless you have the long burning pewter stunt, then it is half that for each day.