[ScottBurson]

Does the client actually ask for such a justification?

Anyway, let's say that you're right: something that would have taken him only 1 hour takes you 3 hours, because you're still learning about the code. I can tell you, speaking as someone whose time is valuable and who has to delegate tasks to people who don't know the code as well as I do, that I know it's going to take them longer, but it's an investment we have to make to get more people up to speed.

I understand that in your circumstances, "relax a little" is not easy advice to take, but it might be the best advice I can give you — along with making sure you have enough uninterrupted work time. It does sound like you need to get out of the house.