If you are driving the car after every charging session, there is no valid reason to not charge to 100%. Trying to calculate when it will hit a specific % during the charging process is almost impossible, especially above 80%. The charging rate is varied based on pack temperature and resistance, and slows down as it gets closer to full. The final part of the process is balancing the cells, and that varies in time based on cell state. The resistance of the pack increases with age and degradation, but there is no chart to spell it out as it is different for every pack. Charging to around 80% should be fairly easy to estimate, based on the SOC and EVSE Charge Rate. Above that is a guessing game.
Charge it and drive it and don't worry about it. There is no hard evidence that regularly charging to less than 100% significantly extends the life of the battery pack. Just don't let it sit at 100% for extended periods, especially in high heat. That is known to speed up degradation, as experienced by those living in hot climates, and is a method used by those with marginal packs to help ensure the necessary drop to get a warranty replacement. If the car is going to be sitting idle for extended periods, it is best to keep the charge state between 20% and 80%.
I live in a hot climate, and just recently had the battery pack replaced under warranty. I have the 80% charge option, and use that with the timer to delay the start of charging until 2:00am. I do that because I don't drive the car every day. On the days that I know I will drive enough to get below 80%, I charge to 100% to balance the cells. Since I have a separate work vehicle, the Leaf can sometimes sit idle for a week. Not letting it go above 80% will help keep degradation in check (along with the dirt parking space under the trees). If I did not have the 80% option, I would have to get a much more expensive EVSE with the ability to control charging.
2013 Leaf SV - Cayenne Red - QC Port - LED Headlights