... do any of your clients expect you to account for your hours?
A client I have been working for for over a year for 2 days per month has now asked me to detail the hours I've spent on my invoices.
While I can do this (and have others for whom I work on a time-charged basis so I can use a time-tracker) I think it goes against the spirit of the retainer.
It's not as if I do nothing either - I hear from this client at least 3 x a week, and always respond the same day.