9.4. Older (Obsolete) Limits First edition of TRL1 contained some additional limits, which have been relaxed in the second edition in order to make implementation possible for a large set of computers. These limits are: [Clock granularity] Was defined to be at least of a millisecond. Far from all computers provide this granularity, so the requirement have been relaxed. The current requirement is a granularity of at least one second, although a millisecond granularity is advised.