When we started 11 years ago, we abided (the dude abides) by the adage of work hard, wear often, wash rarely for our jeans. That advice remains as strong as ever.
We recommend washing your jeans infrequently. Typically about every 80-100 wears. Sometimes less, sometimes more depending on the season and your activities. Bottom line, don't overdue it. You will know when you need to wash your jeans. The more you wash your jeans, the quicker they will break down and the lighter they will become.
Bottom line: wash your jeans infrequently. If unsure, don't wash. If sure, wash.