Quarantining is just a precaution in case the new snake has any diseases or parasites. Like stated before, once you get a larger collection you need to be getting in the habbit of quarantining because it is easily for a disease to pass from snake to snake. People have had their whole collections wiped out because they didn't quarantine. A disease like IBD is untreatable and fatal so you definitely wouldn't want that spreading in your collection, so whenever I get a python or boa I always keep it away from my established collection for a certain amount of months until I feel it's safe enough to introduce it to my established collection.

I always watch and check the new snakes for the entire quarantining process so I can spot certain things like RI, IBD, mites, ticks, odd behavior, etc. just in case. When my Kingsnake got RI I immediately moved it out of my room into a different room to be quarantined. He is still in my quarantine room, never really thought of moving him. I have my two newest snakes (Blood pythons) I got on Saturday in the quarantine room right now, and I'm checking their water dishes daily for any drowned mites and I'm trying to take them out of their enclosure to see if their skin twitches or if I see mites crawling around on them.

I normally quarantine for two months, rarely ever one month. I just moved my Beardie into my room with my established collection to get her out of the quarantine room. She's been in there since November 14, and I feel it's safe to let her in with my established collection.