Another term for a spell, however, a let-up usually refers to a short break, not a lengthy spell in the paddock. Found on http://www.encyclo.co.uk/local/21679
Let'-up` (lĕt'ŭp`) noun [ See Let to forbear.] Abatement; also, cessation; as, it blew a gale for three days without any let-up . [ Colloq.] Found on http://www.encyclo.co.uk/webster/L/33