const unsigned long second = 1000;
const unsigned long minute = 60 * second;
const unsigned long hour = 60 * minute;
const unsigned long day = 24 * hour;
delay(4 * hour);
const unsigned long second = 1000;
const unsigned long minute = 60 * second;
const unsigned long hour = 60 * minute;
const unsigned long day = 24 * hour;
delay(4 * hour);