simpler

integer LEASED_UNTIL = 200;
integer DAYSEC = 86400;

string timespanHover(integer time)
{
    integer days = time / DAYSEC;
    integer curtime = (time / DAYSEC) - (time % DAYSEC);
    integer hours = curtime / 3600;
    integer minutes = (curtime % 3600) / 60;
    integer seconds = curtime % 60;

    return (string)llAbs(days) + " days, " + (string)llAbs(hours) + " hours,\n"
        + (string)llAbs(minutes) + " minutes, " + (string)llAbs(seconds) + " seconds";
}

default
{
    touch_start(integer total_number)
    {
        //basicaly paying it adds multiple of these
        //this woudl be a pay per add time
        LEASED_UNTIL = LEASED_UNTIL + (1 * DAYSEC);
    }

    state_entry()
    {
        llSetTimerEvent(0.5); //0.5 sec checks
    }

    timer()
    {
        llSetText("Rent due in:\n" + timespanHover(LEASED_UNTIL + llGetUnixTime()), <0.0, 1.0, 0.0>, 1.0);
    }
}