Code:
on *:text:!track*:#:{
  if !$2 || !$3 {
    .notice $nick Usage: !track <item> <time in hours> [item 2]
    .notice $nick [item 2] is optional
  }
  else .timer 1 $calc($3 * 3600) .msg $chan $2 on $iif($4,$4,$nick) has expired
}