I now spend about a day a week doing mechanic work
By day, do you mean evening or an actual 9-5 day? If the latter your either have a lot of mates, they ride properly shonky kit or you are very slow! If it is that much you might need to think of it as a business and charge accordingly ...or maybe learn to say no! As much as I like a bit of spannering I've got too much going on in my life to devote a seventh of it to my friends' bikes.