The vine balls DO get demolished kind of quickly. Since I only have three birds, three of them last about a week. I thread some jute through three of them and hang them from the top of the cage, so the top ball is about 3 inches BELOW the perch. The bottom one is just out of their reach if they are on the bottom of the cage. This way, they have to pull the string up with their beak and foot to get the ball within reach. This makes it a bit more challenging and makes the toy last a little longer.

I give them this toy about once a month.

That's why a while ago I was so set to find vine strings... I make my own in a little variation and they can destroy up to 20 of them for a fiver lol