Depends on what you need to earn not the amount of clients, I started out with goals and targets then quickly realised I dont need to stress about building my round up to fast, partly because of my circumstances and the fact that as a single parent tax credits will help you while you have a shorfall of work, so my round is slowly building itself now if I do need to boost it from part time to full time I'll canvass a little but I'm in no hurry.