Collection proceeds until the desired quantity of the item has been obtained, or the given number of days has passed, whichever comes first. If neither number or days is given, collect will continue until the location's supply of the item is fully depleted.
Collection ceases when no more of the resource is available in the location.
The resource to be collected. For instance, recruiting requires the attention of a noble. Additional men are of no benefit. Fishing, however, requires sailors. The noble himself does not participate.