loop excatly every 10 seconds

Hi together,

i want to go through a Loop every 10 seconds. But depending the code inside the loop, the time differs.

E. g.

 Do
   Select
   Case @SEC = 0 or @SEC = 10 or @SEC = 20 or @SEC = 30 or @SEC = 40 or @SEC = 50
      ... do something ...

   end select

 Until $bHotKeyPressed

 How can i be sure that the loop will be done exactly on the 10'th of a second?

Thanks for your help!

Dizzy