If I was happy with the work and price I'd have paid it. But whether you've had what you've been quoted for I'm not so sure about. If the itemised quote is costed, then I'd say certainly not, but if it looks like the workings out then maybe you have. I wonder what would have happened if it had taken longer, would they have been saying they hadn't quoted for that?
It seems a bit amateurish, when I did such things a quote would be fixed and not included a time breakdown, but an estimate would in order for it to be invoiced against on completion.
Realistically, I suspect you were never going to get two days work, including costs and materials for £325.