So add another mile to your runs and you'll be over 45mpw and you've only ost 5-10 minutes a day to running depending on your pace.
If you find yourself struggling to get out the door after work for a run and it's not other things holding you back like family, injuries, etc..., you probably don't enjoy running that much to be doing more mileage. Most people don't have running at the top of their priorities which is why you usually won't seeing anyone running during the cold dark winter evenings after work.