Hi mate, better to water more less often. They dont like wet feet!
I water my girls (similar size to yours) in 3 gal pots every 4-5 days. I water 3L. That gives 20% runoff. My temps are 24°C-27°C daytime and 22-23°c night RH is 50%-55%.
Hopefully that info can help you tune yours.
If I had to guess I'd probably say you want 4.5L every 4-5 days.
Good luck with your grow mate 🙂