[pasta]

To add: you can even charge by the hour in blocks of 4 if you feel more like it.

It will be the same as charging per half day, but it can help you and your client to accept that charging daily will be the next step.

[cubano]

This is what I am currently doing...plus, since everyone loves a "deal", I charge a slightly higher hourly rate then give away "one hour FREE" because we all know that FREE is the most powerful word in marketing.

Basically, I figure out what I would be happy with for 5 hours for work and then give them 4 hours plus one FREE hour for that amount.

This has the added benefit of nudging my hourly rate higher, since I always have a hard time raising my rates.