Every office has them.

The employee who treats work like a second home. The one who arrives before sunrise and disappears by lunch. The midweek warrior. The stealth drop-in.

As the return-to-office wars have subsided, they’ve left behind a workplace ecosystem populated by distinct species whose routines are shaped by a mix of company policy and personal preference.

Business Insider spoke with a half-dozen office workers about how they navigate workplace expectations around office attendance — and why they’ve landed on the routines they have:

The 5-day faithful

Shaohua Zhou is unapologetically pro-office.

The engineering manager, based in San…