This forces the use of seconds as unit. The interval values I have been using a lot myself are between 0.2s and 0.5s because I usually want a lot more granularity in my lookups than the 1s interval. Could it be better to allow values lower than 1s or let this value be a string with optional "s" or "ms" units?
Linux "watch" uses just seconds. If I remember correctly the psql doesn't use units in settings, so I prefer just the value from interval 0.1 .. 3600 * n
