How long do babies actually use a bassinet?

Across the parenting communities we read, most babies outgrow a bassinet between 3 and 6 months, either by hitting the weight limit (typically 15–20 lbs) or by starting to roll or push up. Multiple Reddit threads on r/Buyingforbaby explicitly warn first-time parents that 'they don't stay in a bassinet for very long,' so spending $400+ may not pay off for every family.