With a 10 amp charge about 1 hour if the battery is totally dead. You should really use an automatic battery charger that shuts off when the battery is fully charged to avoid overcharging.
yes as long as it is not totally dead.
Not at all. A 35 amp charger is far too large to charge a lawn mower battery. Use a 10 amp automatic charger.
Depends on the output of the charger which you did not list. A dead battery can be recharged with a 10 amp charger in 3 hours.
If it is totally dead it will take at least 12 hours.
I usually do over night.
yes as long as it is a 12volt battery - i have done it many times.
Yes, but it takes a very, very long time. The charging system on the riding mower is very low amperage. You would do much better charging it with a battery charger.
It cuts the lawn/ grass when it gets long
No, you will not damage a lawn mower by cutting long grass. A lawn mower is designed to cut grass. You may damage the blades if you mow over a exposed tree root or a rock. If the grass is really long and thing just raise the height of the mower and take it slow but don't worry you won't damage the mower. This is just an urban myth.
Build a ramp. Get a good long run at it.
till its charged...put it on slow charge and let it set the night. Here is the big secret on batteries....with both post exposed and not running, just the air afloat in the air will drain the battery, solution....when you are going to store for the winter, pull the battery out, put it in a ice chest, or sealed container so air does not get to it, and I think you will find next season it will still be charged.
All eternity until about 1827, when the first lawn mower was invented by Edwin Budding in Thrupp, just outside Stroud, in Gloucestershire.