[AlexanderHowl]

Healing assumes 1 day per HT roll with 24 hours of rest (take Regeneration if you want to heal without rest). If we assume that normal rest is required for even the remotest chance of healing, it would probably be realistic to give a penalty of -1 to the HT roll for every 1.6 hours spent resting during a day. For example, if someone spent 8 hours at work and 1.6 hours outside of resting, they would suffer -6 to their HT rolls. FP recovery does not require HT rolls, so Time Modifiers would be meaningless, as you recover FP as long as you rest, and is unrelated to healing (though reducing fitness by one level while recovering from non-critical injuries and by two levels while recovering from critical injuries, minimum Very Unfit, would probably be realistic).