Similar here - I've got a 'day rate' for on site visits - they're whole day (usually multi day) affairs. I have hourly as well, for smaller chunks of time, and I'm generally doing those from home. ATM I've still got a number of smaller projects that will never take up a whole day of work at any one time, so hourly fits those, but I'll probably move toward daily rates for more work in the future. It generally keeps me more focused and more productive on that one client's projects than trying to juggle 3-4 things in one day for 1-3 hours at a stretch.