Weekly review (founders, 30-60 min) — what happened this week, what's blocked, what's next week's one priority. The minimum-viable management ritual. Skip it once, the team drifts within a fortnight.
Monthly close (founder + finance lead, 2-4 hours) — books closed, MRR/ARR computed, runway updated, investor update sent within a week of month-end. The discipline that turns gut into numbers.
Quarterly planning (whole team, 1-2 days) — what we accomplished last quarter, what the three biggest bets are this quarter, who owns each. Goes wrong when teams plan twelve things; it works when they plan three.
Pre-Series A you don't need OKRs, weekly KPI reviews, all-hands every week, or a separate operations meeting. Add when the symptom appears, not in anticipation.