This speaks about time as if it were a commodity that a person could spend. The word "they" refers to Judas and Silas. Alternate translation: "After they stayed there for a while" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This can be stated in active form. Alternate translation: "the brothers sent Judas and Silas back in peace" (See: [[rc://en/ta/man/translate/figs-activepassive]])