My prior experience at FR was that I did better with more or less constant tugging, including at night. That was easier with T-tapes due to the high comfort level--no pinching as tends to happen with tapeless tuggers. You will have to find your own best routine. There may be other factors in your life, besides how long you can comfortably wear your DTR, that influence your tugging schedule. I try to get in as many hours as I can, others are devoted part-timers who enjoy good growth. I guess I'm a hard gainer, but I also believe that skin growth is mostly a consequence of fairly constant, modest tension. That's how we get all that new skin if we allow ourselves to get obese. Again, though, just use your DTR in the manner most comfortable and convenient for you. You've got lots of time to evaluate results and make changes if you feel it necessary.
In a sense, each of us restorers is reinventing the wheel. There's no such thing as a large scale, clinically supervised, peer reviewed FR study to guide us. We've got to rely on as much anecdotal "evidence" as we can scrape up from boards like this or ones dedicated to FR. There's a wealth of experience out there, and what it shows is that guys have restored to completion doing part-time and 24/7, and using a wide variety of tugging implements. It's all good. The most important thing is sticking with it and using lots of common sense. The skin will grow. It's up to you to be patient.
How much time do you allow for rest and healing?