how long is neem oil mixture good for after mixing?

Does anyone know how long a mixture of neem oil with dawn for dishes and water is good for after mixed? I am going to spray again today, but not sure if I should make a new batch or if I could still use the batch I made for my last spraying. Thanks!

They say to make a new mixture of anything prior to use but I have left it for a day or two then used it and its been fine and effective

same here, left for like 2 days max when I used it, everything seemed fine.

Thanks guys, mine was there for 3 days so I just started a new batch.