Half Dome on only one day

[solo_traveller]

Hi!
I read it is possible to do the half dome on one day... How many hour will it take - only walking and really?
I want to go in the beginning of October... Any advise is highly appreciated!
Also I am looking for company! So let me know if you are around!

[AlmostThere]

You'll need a permit to do Half Dome.

It's only possible in one day if you can hike 16 miles in a day, with a whole lot of uphill.

http://www.nps.gov/yose/planyourvisit/hdpermits.htm