I am potentially about to save you a great deal of time.
If you're not going to follow up on your networking relationships you can stop networking now.
Genuinely, stay in bed. Have another cup of tea. Don't ever go networking again because you are seriously wasting your time.
In fact, you can even stop reading this book now, because the rest of it will not do you any good.
Let me tell you some things that happen to you as you leave a networking event: