The linked article lays out the situation real nicely, you can make both cycling and life work together but it takes effort. The first comment to that piece sums it up perfectly 'quality not quantity'
I don't know much other than this is your first job and probably pretty important to do well with it but if you're like most of us you're also balancing relationships (or will be), family and other things. The key thing is that you don't really need or for most folks even want to train 20 hours per week. I'm assuming of course this job isn't to ride professionally but there are domestic pros and thousands of amateur racers including top category amateurs racing effectively on less than 20 or in many cases 15 hours per week. You can improve and do really well on less but the key is to use your training hours really well.
FWIW, I typically train 7 to 12 hours per week year round with the occasional week off the bike for work travel, non bike vacations, family stuff, etc. During the winter months things lean to the low end of that range and sometimes drop even further when life interrupts and during the race season, especially during the early spring build up things lean to the high end of that range with the occasional big week of 15 to maybe 18 hours but those are rare. The key thing is that the less time on the bike, the more important it is to use that time well so that means training with a plan and doing more focused quality work and less unstructured riding whether that's unstructured group rides or JRA.
During the winter months in particular you really want to have a goal and a plan each time you get on the bike. Sure you can have the occasional JRA day just to get on the bike and enjoy riding but for the most part you leave home or jump on the trainer with specific reasons to do that ride and specific goals whether that's an hour of Tempo, a 2x20 set, a 5x5 set or something else.
Anyway, welcome to the working world and congrats on landing a job in this tough economy. There are lots of ways to deal with the shorter days and your additional time obligations now that you're out of school but you really don't need to train 15 or 20 hours a week even if you want to race but you do have to make the best use of your training time.
Good luck,
-Dave