Contract number: [ complete ]   2019  The FWC is renewed automatically  two  times for 12 months each, unless one of the parties  receives  formal notification  to the contrary at least three months before the end of the ongoing  duration. Renewal does not change or postpone any existing obligations. The contracting authority appoints the contractor for a single FWC for Lot 1,2 3,4 and/or 5.  The period for the provision of the services starts to run from the date on which the specific  contract or order form is signed by the last partyor the date indicated in the specific contractor  order form.  The contracting authority orders services by sending the contractor a request for services or an  order form in paper format or by e-mail or via  e-PRIOR . Within seven working days, the contractor must either:  - send the specific tender or order form back to the contracting authority signed and dated; or  - send an explanation of why it cannot accept the request or order. In case a request for services has been sent, and if the contracting authority approves the specific  tender, it then sends a specific contract or an order form to the contractor. The contractor must  send the specific contract or order form back to the contracting authority signed and dated  within seven working days of receipt.  2 Whenever “working days” are mentioned, this refers to ECDC working days, as per annual ECDC calendar. 6  I.4.3 Implementation of single FWC I.4.2 Period of provision of the services  I.4.1 Appointment of the contractor I.4. A PPOINTMENT OF THE CONTRACTOR AND IMPLEMENTATION OF THE  FWC  I.3.5  Renewal of the FWC I.3.3 The FWC is concluded for a period of 24 months with effect from the date of its entry  into force. Unless otherwise specified, all periods specified in the FWC are calculated  in calendar days.$^{2}$  I.3.4 The parties must sign any specific contract or order form before the FWC expires.  The FWC continues to apply to such specific contracts or order forms after its expiry.  The services relating to such specific contracts or order forms must be performed no  later thansix months after the expiry of the FWC.