High level factories have only 3hr and 9hr options, regular and sentient. Low level factories have 3hr, 9hr, 1day, and 2day options. So the interface for this should be different than the graphic you get by selecting a manufactory.
An even better option, IMO, would be to have manufactories automatically start new productions as soon as they are collected. One way this could be accomplished is with a new building (warehouse). When you select the warehouse, you can specify 3hr, 9r, 1day, or 2day productions. You can also transfer coins, supplies, etc from your main hall to the warehouse, which would hold enough resources for all of your manufactories to do 2-day productions. When productions are automatically started, the required resources are deducted from your warehouse.
So collecting would be reduced to opening up the warehouse, selecting the production time for manufactories (and separately for workshops), making sure it is stocked with resources, and finally by going around the map collecting resources from your manufactories and workshops which immediately start new productions on their own.