[LEAPSECS] Leap smear

[Greg Hennessy]

> Yes, indeed, if we allowed leap seconds to build up at the current

> rate, there would be an issue with an additional hour being required

> in the range of timezones in approximately five and a half thousand

> years' time (one leap second per eighteen months, times 3600 seconds

> per hour).  


Of course leap seconds are expected to build up much more rapidly than
that, they are expected to increase quadradically.

Greg