In this paper, we highlighted the importance of integrating environmental goals into the production system. We recommend the establishment of closed-loop production systems in a supply chain level. To realize closed-loop production systems, we introduced the concept of sustainable supply chain networks. With a SSCN, it is possible to shift successfully from a flow economy to a circular economy by combining environmental and economic issues, thereby improving eco-efficiency.
Standard passport processing generally takes between four to six weeks, but it can take longer during peak travel times.
Because obtaining passports is often time-sensitive, the Passport Office at the U.S. Department of State displays the latest processing times on its website. Passport applications ordinarily take four to six weeks. Expedited processing reduces the time for an extra fee.