999 hours
The 999-hour timer clearly shows the remaining time and allows you to start, pause or reset the countdown in one click. At the end, the selected melody sounds — you can change its volume or turn it off completely.
The built-in time calculator instantly converts 999 hours to days, minutes, and seconds. The interface is adaptive: it works correctly on smartphones and computers, expands to full screen, and continues to count down accurately even when switching tabs.