The slow approach stretches the cazimi as well: the 17′ window opens and closes over 41.7 to 63.4 hours, 1.7 to 2.6 days. No other planet on these calendars has a cazimi window as long as the longest Mars one. At these cazimis Mars passes 0°16′ to 1°08′ north or south of the Sun's center, never across the disk in these years.
The next Mars cazimi is on March 21, 2028, at 02:36 UTC, at 1°00′ Aries, and Mars holds the 17′ zone from March 19 at 18:53 UTC to March 22, 2028, at 10:18 UTC.
Electional astrologers who want Mars strong for the start of hard physical work, a training block or a contest treat these days as the one usable stretch inside the combustion. Background on the term: what cazimi means.