Looking on the internet deeply has found these results:

Let me know if we need waiting for is the most popular phrase on the web.

Let me know if we need to wait for 131,200,000 results on the web	Let me know if we need waiting for 140,900,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Like I said, we need to wait for Gibbs. We need to wait for Raven to report back. We need to wait for Cowley's group to surround him. We need to wait for Cowley's group to surround him. We need to wait for the results to... We need to wait for Bobo's personal handler. Let me know if you need to stop. Neal, we need to wait for the FBI.	Let me know if we lose contact even for a second. Okay, you let me know if we're going too fast. TWA will let me know if we can have a pink plane. He will let me know if we can be of help. Let me know when he's in custody, and I'll make sure there's a large whisky waiting for you at the press bar. Let me know if we can be of any help on your return journey. I've eaten half the cake waiting for George to call to let me know if I'm off the hook, if we are off the hook, the two of us, you and me. Bender, you'll let me know if we have to cheese it, right?

Let me know if we need to wait for

131,200,000 results on the web

Let me know if we need waiting for

140,900,000 results on the web

More popular!

Let me know if we lose contact even for a second.
Okay, you let me know if we're going too fast.
TWA will let me know if we can have a pink plane.
He will let me know if we can be of help.
Let me know when he's in custody, and I'll make sure there's a large whisky waiting for you at the press bar.
Let me know if we can be of any help on your return journey.
I've eaten half the cake waiting for George to call to let me know if I'm off the hook, if we are off the hook, the two of us, you and me.
Bender, you'll let me know if we have to cheese it, right?