Use the power of technology to perform those tedious tasks. Use your talent and knowledge on the product of your clients and let you applications manage your time.
If anyone could cut their working hours in half and keep their salaries, 100% of people would do it. Now it's your turn. What are the crucial steps that are tedious and time consuming but remain neccesary between you and your client. Let me name a few :
Don't work harder, work more efficiently.
It might take you 3 hours to properly set everything up. That includes you invoicing receipts, email templates, client account solutions, schedule and etc... However, once you are done, you will not only be much more effcient at your work, you will also look much more proffesional. That alone give you the edge against most web design agencies. In montreal, I alone look more proffesional than the majority of my competitors.