This code system http://standardhealthrecord.org/shr/core/cs/SemiquantitativeDurationCS defines the following codes:
| Code | Display | Definition |
| many_years | Many years | Many years |
| several_years | Several years | Several years |
| one_year | About a year | About a year |
| months | Several months but less than a year | Several months but less than a year |
| weeks | Several weeks but less than a month | Several weeks but less than a month |
| days | Several days but less than a week | Several days but less than a week |
| hours | Several hours but less than a day | Several hours but less than a day |
| minutes | Several minutes but less than an hour | Several minutes but less than an hour |
| seconds | Several seconds but less than a minute | Several seconds but less than a minute |
