this has been discussed many time before here on ft....
as per the hilton honors terms & conditions....
A "stay" is defined as the total number of consecutive nights spent at the same hotel, whether or not a guest checks out and checks back in again. The term “stay” under these Terms and Conditions does not include any stays of the following nature: wholesale/tour operator packages; contracted airline crew rates; travel industry rates (including but not limited to travel agent discount rates); complimentary or barter rooms; Reward Stays; NET Group rates; Series Group or IT Group rates; contracted Entertainment or Encore rates; third party websites bookings (irrespective of rate paid); and "opaque" channel bookings where the brand is unknown at the time of purchase. HHonors points may not be earned for ineligible stays or during ineligible stays, including without limitation, folio charges incurred during ineligible stays.