The charger enters Maintenance Charge mode when the charging current has dropped below the ICHG_DONE threshold. The charger continues to charge for the Maintain Charger Time (tMTCHG) to ensure the battery is fully charged before the charger is disabled. The Maintain-Charge Time for the MAX8895 is dependant on how the CT pin is connected.
If a 0.068uF capacitor is connected between CT and AGND the 'Maintain-Charge time' is 4 minutes typical, whereas if CT is connected directly to AGND the 'Maintain Charge Time' will be 5 minutes typical. As per the Electrical Characteristics table in the datasheet the timer accuracy is +/- 30%.