> it's 68 years.
> 32 bit signed is 2.17 Billions in the positive range.
> One day has 86400 seconds, so an average year has 365.25 * 86400
> seconds.
>
> 2.17 * 10^9 / 86400 / 365.25 =~ 68 (years)

People keep inventing complicated methods how to save unused
precious generator values, and you throw away 2.17 Billions of them
just because they are in negative range ?? :-)

Ivan
http://www.volny.cz/iprenosil/interbase