Time element in DT is very important. It can be used to control the number of trades in DT. It can be used in pre-open planning. Once it becomes the integrated part of the DT system, and the mind can follow/stick with it, angel will be able to beat the devil. Mental energy in DT is not unlimited, on the reverse side, it is very limited. We need a tool or a measurement to help us preserve the mental energy. Time based rules will help a lot in this case. To be specific on the rule, it is something like "only do one trade in every half hour".