how%20long%20does%20a%20bottle%20last%20typically?

Depends%20on%20how%20much%20you%20use%20it,%20but%20I%20wash%20my%20hair%20about%20every%203%20days%20and%20use%20it%20in%20between%20and%20I%E2%80%99d%20say%20it%20lasts%20about%202-3%20weeks.%20It%E2%80%99s%20the%20best%20dry%20shampoo%20I%E2%80%99ve%20ever%20used.