How long do wild Pokemon need to stay on Isle Abeens before they can join your team?

On Isle Abeens in Poke Pelago I've had several wild Pokemon visit. When I click on them Mohn tells me that they are enjoying themselves and I should check how they're doing tomorrow. I've tried checking on them 24 hours later and they are gone. How long do Pokemon need to stay on the island before they will want to join your team?

Extra info: I normally keep the Isle stocked with beans, if this makes any difference.

Solution 1:

In my experience, they require an amount of time close to 24 hours. However, they have to be checked up on every few hours in order to have them stay. 10 hours is fine to go unchecked. So you don't need to stop sleeping. However, you must pay attention to them.