Obviously this eye crud is also contagious, as it is spreading to all your chins. Seems to be similar to pink eye in humans. My guess is it isn't going to overly harmful to your chins, but that they would need medicated eye drops to clear it. How is your first chin doing? How much worse has his eye gotten since you first noticed? It doesn't seem to get too severe too quickly and you may have time to recover and be off quarantine to then take them all in to the vet. Since you are being told it will be a wait anyway, can you set up an appointment now for next week - will you be off quarantine by then? You can also double check with the vet that they will be ok if not seen till then.