There is a rule in volunteering called the 100-hour rule. The 100-hour rule is the ideal number of hours you should render for volunteer work per year. This tells us that you should only do a total of two hours of volunteer work per week. However, this does not mean that you are not allowed to volunteer more than two hours per week. You can offer more than two hours of your time per week provided that you have arranged it with the charitable institution you are affiliated with. Also, volunteer work hours should not make it complicated for you to do your regular paying job.