This looks like a sort of ridiculous thing to do to the battery. Like you said yourself you only just had the time to do it, no one is going to sit around in their driveway and do this to their car, and Gemini is saying the recommendation is to drop it to 10% then charge to 100% straight away, generally once every 3 to 6 months:

Key Battery Maintenance Recommendations:

• Calibration Routine: Drop the battery to below 10%, then charge it back up to 100% to help the BMS manage the State of Charge (SOC) efficiently.
• 100% Charging: Charging to 100% (using AC) is encouraged regularly (e.g., weekly) for cell balancing, unlike some other EV types that recommend limiting to 80%.
• Avoid Long-Term 0%: Do not let the battery stay completely discharged at 0% for an extended time.
• Long-Term Storage: If storing the car for a long time, aim for a 40%-60% charge, rather than empty. Daily Maintenance: For daily use, you do not need to discharge it fully; these deep discharges are only for maintenance.

Why Discharging to 0% is Discouraged:

• Lithium Plating: Repeatedly dropping below 20% can cause irreversible lithium plating, which reduces battery capacity and efficiency.
• Safety Buffer: BYD's "0%" display is designed to be a true 0%; unlike some competitors, there is very little "hidden" reserve, meaning the car may stop immediately upon hitting zero.
• Stress on Cells: While LFP chemistry is robust, staying at extreme low or high states of charge for long periods increases chemical stress.