This will emits a sound for each hour, like your average town clock or anything...

bell hour clock.lsl

// CLOCK BELL SCRIPT
// ORIGINAL AUTHOR: Beverly Larkin
// Edited by buttbadger Mirabeau

// Like
// Put below the bell sound name or UUID:
string bell = "bab03683-516a-22a3-a9ec-4a357dbdc587";

// Or some junk
integer H; //Hours
integer M; //Minutes
string AP; //AM or PM
integer i;
integer actualH;

GetHour()
{
    integer T = (integer)llGetWallclock(); // Get time PST
    if (T > 43200) //If it's after noon
    {
        T = T - 43200; //Subtract 12 hours
        AP = "PM";  //set to PM
        H = T / 3600; //get hours
        M = (T - (H * 3600)) / 60; //get minutes
        
        if(H == 0) //if the hour is 0
        {
            H = 12; // make the hour 12
        }
    }
    
    else
    {
        AP = "AM"; //set to AM
        H = T / 3600; //get the hour
        M = (T - (H * 3600)) / 60; //get minutes
        if(H == 0) //if the hour is 0
        {
            H = 12; // make the hour 12
        }
    }
}

default
{
    state_entry()
    {
        llPreloadSound(bell);
        llSetTimerEvent(30.0);
    }
    
    timer()
    {
        GetHour();
        
        if (actualH != H)
        {
            for (i = 0; i < H; ++i)
            {
                llPlaySound(bell, 1.0);
                llPlaySound(bell, 1.0);
                llPlaySound(bell, 1.0);
                llSleep(3.5);
            }
            
            actualH = H;
        }
    }
}