Zacster nailed it for me too - 11 miles each way, and it always takes 55 minutes no matter if I'm riding 12 or 17mph. I ride an older road bike with panniers full of work clothes on an urban MUP and at some places I'm crossing streets every 3 or 4 blocks. When I ride streets there are less stops and I can ride faster... and it takes 55 minutes. Sometimes I feel tired and it seems I'm really slow... and it takes 55 minutes.