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.
There have been times in the past when it could take up to 12 weeks or more to get a passport. More recently, the processing time has been 4-6 weeks for routine service. When demand is low, this can drop down to only 3-4 weeks.