on *:TEXT:brb*:#: { /set %atime $ctime | /set %anick $nick | /set %brb $2- | /msg $chan 7,1 $nick 4,1 will be right back because of :7,1 $2-  }

on *:TEXT:*:#: { 
if ($nick == %anick) { /msg $chan 7,1 Welcome back, %nick $+ , from %brb $+ . You were gone for4 $duration($calc($ctime - %atime)) $+ . | /unset %atime | /unset %anick | /unset %brb }