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Lenovo Laptop Battery can take anywhere from 2-8 hours to charge completely depending on the capacity. Your laptop should have a red/green light display while your computer is charging, which then turns green/blue when it is completed.
The old NiCad rechargeable batteries had "capacity memory" in them. I believe it was a safety feature to prevent the battery from over-charging. However, it backfired in that if you didn't charge the battery to its complete level then that incomplete level of charge would become your new "maximum charge" level.
Now-a-days rechargeable batteries are based on lithium-ion which do not have this problem. While it is still a good practice to drain the battery completely and then charge it up completely, it is not fully necessary and can even hurt your laptop's battery if you do it too much. Always charge to the maximum level whenever possible, but you do not necessarily need to drain it all the way every single time you use it.
Apple designed a hardware implement to actually cut power off to the battery if the battery was charged. This allowed them to get outstanding longevity from batteries in their devices. Other laptop manufacturers just run continuous current through the
Sony Laptop Battery to keep the battery charged at its maximum level at all times. Because the current runs through the battery constantly, it drains the longevity of the battery.
Certainly don't leave your laptop plugged in ALL the time, but you don't worry about trying to make sure you unplug the computer if it completes charging.
Maybe once every 2-4 weeks you can drain the battery completely.
