Easy way is to split your days, no way you are working 16 billable hours 5 days a week, so split your days and set office hours for each client where you are available for ad-hoc meetings. And tell them that you are open to communication outside those hours as well (within reason), but it will be best effort responses. Generally if you are up front they will accept you have other clients to work on, and as long as your billings match what they feel you are doing all is good.<p>This is how I started mine when I did them, it is normal and totally fair to everyone involved. Just gotta set boundaries for yourself and clients. Clients will abuse you, sometimes intentionally, other times unintentionally, if you do not define boundaries. Like gldev said in his comment, it is easy for work to start spilling into the evenings and weekends in an unhealthy way and then you are burnt out and clients start getting upset if you don't reset expectations quick enough.<p>Even when my consulting businesses grew I would set full time to clients at 32hrs a week for every resource, with the other 8 hours being used for admin stuff etc. I also charged weekly rates per resource so a little different than hourly time. For any work less than a full week I would do day rates to fill in odd jobs. And we didn't screw clients either, if something took us 20 minutes no one ever saw a bill for those 20 minutes, they would see an invoice, just no charge for the time (typically this happened more with existing clients calling for support after projects completed).