wait for cannon script

hey guys, i'm scripting a canon and while i can get it to fire and a few othe things i'd really like to make a wait of about 10-20 seconds befor it can be fired again, what would i need to add for that? please remember i'm a scripting boob and am only good at changing numbers. here's the script below:

vector skew;
rotation myRot;
vector myEuler;

default
{
touch_start(integer total_number)
{
//Get the current rotation
myRot=llGetRot();
//Convert from 4 value rot to 3 value euler vector
myEuler=llRot2Up(myRot);
//Play a Sound

llPlaySound("launch", 2.0);
//Fire the projectile
llRezObject("Canon Bullet",
llGetPos()+<-.5, 0, 0>,
myEuler*50+skew,
<0,0,0,0>,0);
}
}


thank in advance

-Crunch

You can use a little timer to put it to sleep.

float sleep_seconds = 15;   // How long to rest between earth shattering kabooms
integer sleeping = FALSE;   // Are we awake now?

vector skew;
rotation myRot;
vector myEuler;

default
{
    touch_start(integer total_number)
    {
        if (sleeping) {
            llWhisper(0, "I are tired cannon, Zzzzzzzz.");
            return;
        }
//Get the current rotation
        myRot=llGetRot();
//Convert from 4 value rot to 3 value euler vector
        myEuler=llRot2Up(myRot);
//Play a Sound
        
        llPlaySound("launch", 2.0);
//Fire the projectile
        llRezObject("Canon Bullet", 
                    llGetPos()+<-.5, 0, 0>, 
                    myEuler*50+skew,
                    <0,0,0,0>,0);

// Go to sleep
        llSetTimerEvent(sleep_seconds);
        sleeping = TRUE;
    }

    timer() {
// wake up and stop the timer
        llSetTimerEvent(0.);
        sleeping = FALSE;
    }
}

absolutly perfect, your the best!