Just under 4 miles going, 5 and a half miles home - 25 minutes each way - with just enough of a hill (the Bristol Frome valley).
I've more than once kicked myself for leaving it 20 years before changing my homeward journey from clogged suburban / urban roads to countryside / wooded parkland and now get to use even more of the wonderful Bristol to Bath railway path- but it couldn't have happened before I had obtained lights suitable for unlit roads and paths. I now usually encounter only a handful of cars each day.
I'm a bit sluggish in the morning because I'm over 50 and ride in on empty, but I ride home about as hard as I can - I count myself extremely lucky to be travelling in the opposite direction to everyone else so with care get in a decent sprint for the last couple of miles.
I now try to extend my homeward journey by 15 miles at least twice a week by turning the wrong way on the railway path - the few percent gradient on the 9 mile ride home is super-moreish and I enjoy the (now longer) final sprint so much more being properly warmed-up. Yet again, how could I have ignored that "green gym" for so long ?