Depends on the job, the distance, the weather, your pace and your bodily reactions to heat. I'm an engineer so public contact /working in a close environment doesn' happen for me so no problem there. 3 miles each way daily years ago, this last year i did occasional 14 mile commutes each way, still no real problem, yes i sweat but am one of those lucky people who dont smell...as far as I know. At 14 miles I take the pace down a notch or two, enjoy it but dont' push and sweat like a pig. So I sweat a bit but don't smell, my I can work in the clothes I've commuted in and pace myself to arrive as fresh as is reasonably possible. And there' nothing better than those summer afternoon s when you'e looking forward to home time...and enjoying those miles home in the sun.