How long do I have to wait after giving my cat a deworming treatment before I can let him share a litterbox with the other cats?

My vet sent us home with a liquid wormer to give my cat tonight. He mentioned keeping the cat quarantined for about 24 hours for a different medication to work, but I forgot to ask about the wormer.
So if I give it to him tonight, how long before I can let him back into the house with the other cats? I just don’t want them all to end up with worms.