Disease causing organisms are basically everywhere.
So unless you buy obviously diseased plants (spots and marks and so on), you don't need to worry as there is nothing you can do really.
Bugs, always check as much as you can before buying.
Then once brought into your room, maybe use a clear tall plasic bag (like the ones used at TJ, not sure you have them near you).
I don't think 6 weeks is necessary at all.
I would say a few days.
Here's what I do with plants that look perfectly fine.
I keep them away from my other plants like in a kitchen or in a bathroom. A few days of darkness won't harm plants.
Check the plants closely once during the day or morning, and then evening (early evening and then maybe once more round around 9 or 10).
I have seen one big mealy bug crawling up along a spike on my paph that looked perfectly 'clean' at the time of purchase. The bug came out either the next day or two days after purchase.
Haven't seen any ever since.
So, inspect the plants closely underside and cracks as much as you can at the store, then keep them away from your other plants while checking on the newly bought plants for any bugs for a few days. If you do not see any bugs for a few days, then it's all good.
never had problem.
Oh, it's also to buy just one or two at a time if space is limited so it's easier for you to deal with the whole quarantine.
Or, better yet, you can just keep them all together just make sure they don't touch other plants, but make sure to inspect the plants daily for any bugs.
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