Mine is an older 150 psi unit from Harbor Freight and can air my rears from 50 psi to 110 psi without tripping the protection (self resetting). If I don't stop to let it cool, it will trip as I'm airing up the fronts from 50 to 80 psi - It is not a 100% duty cycle compressor either. I never measured how long it takes to get all four tires aired back up, but I would guess 30-45 minutes with the cool down period at the mid point. Your DRW has an extra pair of tires to air, but you are not running them as high pressure as my 19.5's (maybe an hour tops to do six tires?). I think I only paid $40 for it when it was on sale and a 20% coupon was applied - Today, you will pay about $10 more for the current model.
