For my clones, I water with my worm tea. It still needs to feed, but doesn’t have the root structure yet. This way, I’m providing her with nutrition through the uptake at the cut. So I’m not sure about how long you should wait.
A clone should be fed like it’s mother once the roots have formed.
I feel for you with your heat wave. It’s not as hot here, but the humidity is oppressive. Not that I’m complaining. We needed the rain, and more still, so I’m thankful for it.
I’ll return when I can…