Because it is? When does the harvest come? How long since it's rained? How long since your kin went out on that hunting party (or off the trail to urinate?) D

Because it is? When does the harvest come? How long since it's rained? How long since your kin went out on that hunting party (or off the trail to urinate?) Do you have time to hit the store on the way to your next appointment? Do you have time this weekend to visit the in-laws? Estimating and forecasting are vital components of adult logistical arrangements, and a basic, inescapable mental faculty of mammals. It's absurd to think a sentient adult can "live in the moment" without conceptually processing past and future and not starve to death—let alone hold down a 20th century profession. Having a critical faculty disrupted by physiological stressors is reasonably pathologized.