Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What are the dimensions of the keyboard shelf? My keyboard is a bit bigger than most. Thanks.
Document: I'm using the desk for my laptop. So the slide out keyboard shelf is used as a charging platform for my tablet and smartphones. At first I thought I'd be able to use the included 3-port usb hub to charge all of my devices, but it doesn't send enough juice to the devices, as they run through the battery power faster than it is replenished. So it can't be used as a usb charging hub.
I'm an 82yo female and I assembled this desk without any help from anybody, in a fairly short time. (I didn't time it.) The drawer and keyboard pullout operate well and it is very sturdy.I especially like the 3-port hub in the right rear corner - - easily accessible, but out of the way. My large printer didn't fit well on the shelf so put it on a small table nearby and use shelf for my paper, tape, stapler, etc.
And that is why this a 4Star and not a 5Star. Thanks.
I like the pull out shelf for the key board I mainly use the top part for my PC but its nice to store when not in use.
Fantastic &#34;Multi&#34; Purpose Desk with pull-out shelf for p.c + shelf for printer.Amazon's price beats any other companies.Easy assembly..Highly recommend! !
Work station was easy to put together by one person. Just wish the station was another foot longer the printer would not fit on the bottom shelf, so I had to put it on the top of desk which takes up most of the desk. Still suites the purpose for what I needed it for.I checked around and for what you are getting this is a great price.
I have been shopping for a new desk that provided me with flexibility and this desk offers me just that. It is big enough for my desktop as well as my laptop and other electronics I have. The USB hub is awesome just for that purpose. I am glad to have purchased it. The only thing that was a bit difficult was that one of the screws was faulty however, I'm not one to stress over such a tiny instance.
The printer shelf is really too small for my printer, (was hoping I might be able to lower it, but there was no way to do this) -  I will still use for books/files, etc. Overall - very pleased with the quality and sturdiness. I have ordered many products from Amazon, but never took the time to write a review before. This time, I felt this product really deserved a few minutes to let them know their attn to detail and quality was much appreciated.
The picture doesn't do this desk justice. It has plenty of room for everything I keep on my desk and is nice and sturdy. It was really easy to put together and looks great. The only reason I gave it 4 stars is that the sliders for the drawer and the keyboard stick a little.
Read them carefully and make sure each piece is assembled in the orientation shown - the drawer slide are especially tricky in that respect. The assembled product is sturdy and attractive. with plenty of space for monitor, keyboard, mouse, CPU, external disk drives, external DVD drives, and so forth.
Answer: 20 inches wide by 11 inches deep (20"x11")