Once.
153 times
you can put it on one single howrse and then you can edit it as many times as you like
You can give your friend an item on howrse as many times as you want! You can give your friend a horse but only on the private sales. Hope this helped...
3 or 4 times a day
There is no limit to the amount of horses you can have on howrse.
Well, first you can put it on your horse. After that, you can edit it's name (click on the paintbrush and it will have a link with Apollo's Lyre on it) and you can edit it as many times as you want (:
4 times
Three. A female can be covered three times, the same as a male can only cover three mares.
As many times as you want
Howrse Helper is a Wiki-like 'fan site' for Howrse that is not located on the domain name howrse I've been to HH and it is NOT a part of howrse, but I reccomend it as it has many useful links and answers, and helped me a LOT with objectives.
as long as it has enough energy and then you can age it and do it again some more. usually its 3 times
Never.