careful: Having been out for a long time
How long is 'a long time'?
The one-day 'Special Assembly Day' was introduced as a replacement for one of the two annual two-day circuit assemblies from September 1987.
Kingdom Ministry, February 1987
Simplification Helps Us to “Make Sure of the More Important Things”
ANNUAL CIRCUIT ASSEMBLY
By means of a letter from the Society, all congregations have learned that, starting September 1987, each circuit will have one circuit assembly a year.
SPECIAL ASSEMBLY DAY
For a number of years now, about half of the circuits in this country have had opportunity to hold a special event each year, featuring a speaker from Brooklyn Bethel. On such occasions a two- or three-hour program has been presented. The Society is adjusting this arrangement so that beginning September 1987, it will be possible for each circuit or section of a circuit to have a special assembly day.
This means that the first of these new one day 'Special Assembly Days' could have taken place on Saturday, September 5, 1987