Should one stretch or prolong the lam mushaddad and lam sakin?

Question
Should one stretch or prolong the lam mushaddad and lam sakin?
Answer
The is of the letters of , which have a middle of the road time for the running of sound, not too long and not too short.  The timing of the saakinah and mushaddahah should be the same timing as the and saakinah and mushaddadah.