The original form does not specify a time each week that make it difficult and time-consuming to think this generation will start producing what and how much time to complete.
Original form is not given time to produce each week. This makes it difficult and time consuming to think that this model will begin production of a few hours and will be completed much time.
The original form will not enter the production time each week. The difficult and time consuming to think that this version will start production time and will finish time.