Lizzie ,
You have not only defeated the purpose of providing extended time, but you have made it LEGALLY necessary to give the student with a disability even MORE time. The extended time is not time added on to what the instructor thinks is necessary. It is an extension over the time everyone else is given. If you give everyone more time, then the student with a disability gets their extended time on top of that. Go back and review the section on extended time again. You seem to have lost the concept in there somewhere. The purpose IS to give everyone the same chance to do well on the test. THAT is why the student with the disability is getting more time -- because they will not have the same chance without it.
Dr. Jane Jarrow