All you can do is give it a try. My commute here in the states ranges from 16 to 18.5 (and on some occasions is 31.5) miles depending on which route I take. When I lived in the UK it was 21.5 miles. Most I've done is 3 days a week both here in the states and back in the UK. I usually have longer rides on the weekend and I'm not in shape enough to commute 5 days and still enjoy my long rides on the weekends. Plus I like to drive in and refresh my clothes, stock up the fridge with lunch fixings, etc. at least once a week. I don't carry anything on my commute other than my wallet, phone, keys, and tube/pump in my jersey pockets so would always drive in at least one day a week.
I'd say go for it and see how it goes!