Denver for the Day

I don't want to sound like I'm from the 1800's (though sometimes I feel that I am) but it amazes me that I can, and have on several occasions, commuted to Denver for a day's work. I caught the 8:05am flight out and was home by 7pm. It just seems like a commute like that would involve a longer day. Granted I only worked for around 4 hours of that day and spent 6 ish hours traveling, but it is still remarkable.