There is an app called t-sheets that's pretty inexpensive ($16 a mo. +$4 per user that allows you to track them. It also interfaces with quick books . Check it out and see if it accomplishes what you need.
www.tryhousecall.com/TMF you can communicate with your techs via the app, plus we know exactly when they start and finish a job. I provided you our TMF promo code just in case you ever sign up you'll get up to 20% off for life.