Nope! Once you purchase a course, you can view it as many times as you want.  You can do the course as fast or slow as you want.  Courses do not expire, and therefore, this is no time frame to complete your courses!

You can also view it from any machine in the world, whenever you want - forever!  This is one of the best features of Petrolessons, and we hope that students will be able to benefit from the limitless possibilities.