Preposition

[ggomad]

In the following sentence, should I need to fill the preposition "in" in the blank or is it okay to leave the sentence as it is?

Learn how to quickly and easily investigate just about anyone on line ( )as as 15 minutes.


Kindly advise me.

[Casiopea]

In the following sentence, should I need to fill the preposition "in" in the blank or is it okay to leave the sentence as it is?

Learn how to quickly and easily investigate just about anyone on line ( )as as 15 minutes.


Kindly advise me.

Technically, I'd say you need it.

...in as _____as 15 minutes.
...in no time at all.
...in 15 minutes

Preposition, like 'in', often head phrases that function adverbally. Without 'in', the phrase as___as 15 minutes expresses a comparison.

All the best, :D

[ggomad]

Thank you very much, indeed!
You are always helpful as ever.

Best wishes,

[Casiopea]

Thank you very much, indeed!
You are always helpful as ever.

Best wishes,

You're welcome. :D