As you have a business, be aware that Facebook (naturally) would very much like you to pay them.
One of the ways this will materialize is that after a certain number of followers/friends, your posts are no longer automatically distributed to all of them but rather some random sample of them -- and you have no idea which ones got the message and which ones didn't.
Unless you fork out for business promotion services, ofcourse.
No idea what the limit is, probably won't be a problem until you're into 3 digits at least. But that's just one example of the things they do and they're inventing new ones all the time. Nothing on a service like Facebook is guaranteed, they can and will change anything, anytime, in any way they choose.