It's very hard on the battery to go down to 0%.

It's kind of hard on the battery to go below 10% or over 90%.

Charging rate gradually slows down as it gets near 100%. That's why the last 20% takes so long.

Some charging stations charge at a faster rate than others. Tesla Navigation screen has a map showing all the nearby charging stations and how fast they charge.

Usually recharging gives me enough time to either eat lunch or take a nap. I don't have enough time to do both.