How difficult is it to mentally calculate the needed capacity (kWh based on present SOC) to achieve 80% SOC, and divide that by your EVSE charge rate
to determine a needed time? It takes me less that three seconds to set my start time to end at 6:00 AM on either of my two Leafs, knowing my L2 charge rate is about 5kW/hr. Even your middle school kid or grand kid would find it an easy effort, if you need help! An error of +/- 5% will be adequate to achieve
the desired result (max SOC ~ 80%).
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F