I Day is a duration of time, and if you attach a spacialized resources to a duration, to one or more days or other units of time, then you can refer to this duration as committed, or potentially committed to future events, or something used or consumed in past events. If the resource is a person's time or presence, this is a resource like aspect of the agent involved. When process specifications have units of a general kind of agent work, those can be committed from pools in early planning and allocated and consumed in team sprint processes. Here the event's spacial aspect is localized to the agent wherever the might be when perfofming the acts of a process.