Phalaenopsis Watering Advice - Complete Beginner

[Kevstar]

Hi guys, I’m completely new to this!
I’ve had many Phals over the years (gifts etc.) and got rid of them once the flowers had dropped as I was completely clueless on how to look after them and now realise what a waste that was!!!
My wife recently received one as a gift and I am determined to keep this one alive and also get a few more as they are beautiful.
The thing that baffles me is the watering of them. A good friend of mine has got around 20 beautiful phals in her home and assures me that they are “easy to care for and hardier than you think”. She advised me to soak them once a week for a few hours and let it drain and then I’ll be well away.
So upon her advice, I soaked mine, let it drain and it looks happy..
Now (2 days later) I have noticed the roots at the base of the leaves (above the potting medium) have returned to a silvery white colour but the roots in the pot (under the potting medium) are still green.
As we are having an exceptionally hot summer here in the UK, I figured maybe it’s drying out quicker than normal so I gave it a little mist but I’m worried I’m over watering it if I do this…
So my (very long) question is; do I wait for all of the roots to turn a silvery colour before I re-soak it or is there a better way to know when to water?
Many thanks.
Kev.