25 Time library [time]

25.5 Class template duration [time.duration]

25.5.4 Special values [time.duration.special]

static constexpr duration zero();
Returns: duration(duration_­values<rep>::zero()).
static constexpr duration min();
Returns: duration(duration_­values<rep>::min()).
static constexpr duration max();
Returns: duration(duration_­values<rep>::max()).