catflap.org Online Dictionary Query

  not all that often /nˌɒt ˈɔːl ðat ˈɒfən/
   [coll.] nicht allzu oft
   see: all too, far too, too, not all that many, not all that much, She was not all that enthusiastic., I'll eat fish but I'm not all that fond / not overfond of it.