Poll Results

Total votes: 3337

Rarely; less than once a month: 951 (28.5%)
Never: 547 (16.4%)
At least 5 days a week, often more: 291 (8.7%)
Once a month or so: 268 (8.0%)
Every day: 263 (7.9%)
Once every week or two: 254 (7.6%)
1 or 2 days a week: 232 (7.0%)
5 days a week, pretty much: 207 (6.2%)
3 or 4 days a week: 190 (5.7%)
At least 5 days a week, sometimes more: 134 (4.0%)

One option it was remiss of me not to include, as evidenced by two comments I received, was "I work on public transport."