At the moment you have 11 days of vacation you can use. You can activate this as long as its not your turn to move in any of your games.
When you go from your homepage to your online games page, if you look at the menu options on the right side, it will show items like this;
* Home * Current Games
* Start New Game * Games Archive
* Open Seeks * My Stats
* View Players * Settings <-------
* Top Rated Games * Help
You see above where i entered the arrow, click on the settings link on your games page.
If you can't find it, its on this link below
http://www.chess.com/home/echess_settings.html
Scroll down that settings page to where it says
Vacation PAUSE MY GAMES! I'm on vacation: please pause all of my games!
Check/tick mark that box if you "Are" going on vacation
UN check/tick mark that box if you want vacation time 'Removed' from games
It is very Important you remember to save the settings changes by clicking "Save Preferences" at the bottom of that page before closing or leaving that window otherwise any changes you made won't happen.
Is it possible to have some days for holiday without being a premium member?
I need to leave for some days and I don't want to lose on time in my online chess games!
Yet, I have not paid for a membership.