I'm just wondering generally about signing up for an available tee time for nine holes only on a championship course. Sometimes I want to play but simply don't have time (or the desire) to dedicate the five or six (or more

) hours out of my day REQUIRED TO PLAY 18 HOLES, INCLUDING TRAVEL TIME TO AND FROM, WARMUPS, ETC.
Is it a generally accepted practice? Is it frowned upon by the general championship playing community? Is there any official position by the powers that be?
Thanks for any information or thoughts you can provide.