wait (for) 20 minutes

[Lost_Soul]

Hi,

Could you tell me which is right:
1. You have to wait about 20 minutes since the last request to the application
2. You have to wait for about 20 minutes since the last request to the application

(Or could you offer your own version if none of those is right)

Thank you very much.

[Gronny]

I don't understand that sentence well.. can you give more information about what you want to say?

[Haihao]

How about: You have to wait about 20 minutes after the last request to the application.

[Lost_Soul]

Hi, Thank you for your replies :)

But I'd like to know opinions of native speakers. What would you consider natural?
I'm still hoping to get your help...

[Yankee]

Hi LS

I would replace 'since' with 'after'.

I prefer 'wait about 20 minutes', but you can also add 'for'.
You might also say 'You have to allow 20 minutes after the last request'.
.
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