Bids and bid securities shall be valid for a period of <<number of days >> days from the date of opening of bids. (In no case shall this be more than one hundred eighty (180) calendar days from the date of opening of bids). The award of the contract to the winning bidder shall be made within the period of the validity of the bids. The bidding proposals and documents of the winning bidder shall remain with and be considered the property of the LGU. All other bidding proposals and documents, including the bid securities, shall be returned to the losing bidders within 5 days from the execution of the contract between the LGU and the winning bidder.