How long do guys wait before they text a girl after a first date?

Anonymous
I don't see anything wrong with a woman texting a man first. Hats off to the ladies who do have the confidence to text a man first.
I've been out of the dating game for nearly 3 years now and went on my first date a few days ago. I was extremely nervous. Getting yourself back out there is pretty nerve wrecking.
The guy who I went on a date with is the complete opposite. You could tell that he is very confident and experienced in dating.
Long story short, the date was brilliant. After a few minutes my nerves went away. I even made him laugh more then he made me laugh.
After the date I got a text off him straight away. But now it's been 4 days and I still haven't heard anything.
What I want to know is how long do guys wait before they text a girl? If you don't hear from a guy within a week, should I take that as a red flag, that he isn't interested.
How long do guys wait before they text a girl after a first date?
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