How often do they put down cats or kittens? And how long do they stay before putting them down.

Call ! !

Depends on how long they have been there, how much room rhey have, how many will be coming out of hold in the receiving area...to spay an neuter animals is one of rhe best things anyone could ever do to help any animals...they will make sure this is done to all their animals they adopt out.

It depends on how crowded they are. If they get a cold it isn't good. If they need room then it happens quicker. It's sad but true