Comment by gmiller123456

The physical effort of setting a clock is not the issue. Switching to "leap hours" would involve a good part of the world living with about 9am sunrise (or a 3:30pm sunset) for hundreds of years. It'd be a really hard sell to say that's actually better. DST is adjusting to the amount of daylight available, so there's not much of a negative impact. Systems that need to be more accurate just set their time zones to UTC. And one second every year or so is far within the accuracy of a typical computer clock, so anything that needs something better is already going to have a complex time synchronization system.