[General] won't take up much of your time

[Silverobama]

Hi teachers.

I want to ask someone for help but I don't want to use too long of his time. I said "I won't take up much of your time".

Is my sentence natural?

 

[Rover_KE]

Yes, it is, but what I've underlined isn't natural.

 

[Silverobama]

Yes, it is, but what I've underlined isn't natural.

I don't want to use his time for too long.

Is this natural?

 

[jutfrank]

No.

I don't want to take up too much of his time.