Definitely possible. When I have early duty ins (the past three weeks) I am in the hotel by early afternoon. If you can work on your computer then you can in theory work the HR job 7 days a week because (depending on your regional) you WILL have plenty of downtime in hotels. I keep busy on my computer doing student records for the flight school I worked for. Not the most fun job but it's extra income while on the road. Plenty of opportunities.