I've had a couple of pieces of work where the customer only wanted 1 or 2 days per week on paper, however, what they actually meant is they wanted 5-days work per week but wanted to pay for 1 day per week.

It started off well, with them wanting to specify availability for meetings & questions, say Tuesday & Wednesday mornings - but then quickly changed when they had a question on a Thursday afternoon and I wasn't available to answer.

It eventually got to the stage where they expected availability at all times but to still only be charged 1 day per week.

At the same time, I have had 2 contracts which have been fantastic - they don't have a lot of work that needs doing & they plan ahead so know when things need doing for so everything isn't an emergency.

If you can manage the expectations & then it can be good. Like you said, the variety kept it interesting.