I'm unaware if this is common knowledge, as I've only recently started looking to complete my recipe list. So, I've learned something interesting whilst looking for the last couple green tier recipes I need. The drop rate apparently has a timer of 10 mins from the last green recipe you have found.

I spent around an hour and wrote down all the times that I found a green recipe and they were on average 11mins apart. Take away time from logging out and back in and the short distance between containers I was browsing and it seems rather obvious.

To further test this, once I found a green recipe I stopped searching for 10 mins. Once I continued on my route almost immediately I found another green recipe not at all far from where I had moved from the last find. In fact, I was in the same building that usually takes me about a minute or less to scour. While typing this out, I have now done what I've just said a second time.

So when searching for green tiered recipes, keep in mind that the moment you find one there is a 10 min cooldown period before you can find the next.

Hope this helps those, that like me, want to collect all the recipes lol.