On dark turn Led on and off in an hr

Other Hardware Sensors
7

So where is something that indicates you have been on for an hour, and are now waiting for daylight to occur?

i.e.
if (ldrValue<=512 && waiting_for_day == 0){ // finally dark out, and has not been daylight yet
turn on LED, start darkStart timer
waiting_for_day = 1; // don't start 1 hour again until its daylight
}
if ( (darkStart +duration)>=millis() ) {
turn off LED
}
if ( ldrValue >=512){
waiting_for_day = 0; // daytime, can look for nighttime now
}