A cracked cabin window under 25 hours of operation requires which condition?

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A cracked cabin window cannot safely be subjected to cabin pressure, because the differential load across the pane can drive crack growth or lead to failure. So, when a window is cracked, the aircraft should not be pressurized. If the crack is discovered and the operation falls within the allowed time window of under 25 hours, the aircraft may be flown without cabin pressurization so it can be ferried to a maintenance base for replacement. Eliminating the pressure load removes the primary stress that could cause the crack to propagate, making a non-pressurized flight the safest temporary condition. Flying with pressurization or maintaining any cabin differential would increase the risk of a catastrophic failure, and normal operation is not permitted until the window is repaired. Hence, the required condition is to operate with no cabin pressurization within that 25-hour window.