I'm not entirely sure. I usually have plans with people in the evenings. Plus, I'm an extrovert so I get my energy from people. Even if I do feel introverted, I would go to a local coffee shop just so there'll be people there so I can still be alone, but still be around people at the same time.
Typically, though.....since my life is getting back to normal, I am returning to my normal routine of being by myself after work besides working out with friends. So....minus sleeping at night time....I probably calculate 20 hours of alone time