how long is it before it's ok to like someone?

Chelcie • 27👱🏻‍♀️ Mum to 2 girls 🫶🏼 Adhd/Bpd 🧠 England 🌍
So I've been seeing this guy for about a week now, not long at all I know. 
But in this time it's been so lovely. 
We do like each other and hope for something to come out of it.. 
we talk everyday and have met up a lot and I stayed over his and he took me out for dinner.. 
I was just wondering.. can you really put a time on how long it takes for you to be able to say you actually really like someone? 
Any stories you ladies have please share x