Multi-year seasons/office terms/numerical ranges are acceptable as long as the duration/range size remains constant, and no years/numbers are irregularly skipped. Irregular term lengths are acceptable, if a common year exists between them (e.g. 2000–2001→2001–2005). For categories with irregular ranges and gaps, see {{Irregular navseasoncats}}.
The length of each duration/range is automatically determined from the originating category name, up to and including 10 years. MOS:DATERANGE compliance is preferred, but some deviation is allowed and tracked. {{Category redirect}}s are followed, and tracked for either MOS contravention (to be corrected) or for navigational aid (no error). The gap size between successive durations/ranges is also automatically determined, up to and including 5 years if a surrounding category is found, and defaults to 0 (e.g. 1995–96 → 1996–97).
Automatically condensed year display is supported for presidential categories only (but can be easily expanded as needed), for gaps up to and including 5 years, and defaults to 1. To skip gaps up to 10–15 years (position-dependent) in any year categories, use |skip-gaps=yes.
Ordinal words do not work above the ninety-ninth, because no higher working examples were found.
Where a fixed number is part of the prefix text, e.g. Chapter 11 bankruptcies, a non-breaking space may force the template to work. See [1], where {{title year}} skipped over "11" as part of a word rather than a discrete number. (This is no longer required in that example.)
General: for large, permanent gaps between successive categories, or when the base category name changes, use {{Category pair}} in addition to {{Navseasoncats}} on both sides of the gap/name change. Even if {{Navseasoncats}} is isolated, it has the benefit of confirming the absence of nearby categories to the reader or maintainer. "Permanent gaps" means gaps where it is confirmed that there is no data to be created, not just current gaps on Wikipedia.
Technically, this is an inappropriate category for {{Navseasoncats}} placement, but it best shows the |list-all-links=yes behavior for all element variants (blue, red/grey, hidden, and redirect), and would otherwise display as:
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