Sometimes the shipment (especially high value items) may take 1-2 days for custom clearance, therefore do not worry too much as the shipment shall deliver to you within 1-2 days (post estimated arrival date) if there is a delay. You can call up your local Fedex Toll Free number to check the status of delivery (www.fedex.com). If you require further  assistance, please feel free to contact us by creating a support ticket.

In general, it is common for the delivery to take 4-5 working days.

 
Reasons behind delays in shipments:

1. custom clearance
2. flight delay - bad weather
3. address correction
4. remote delivery area
5. missing information such as a number to call before delivery
6. festive seasons
7. no one accept the package when delivery

And of course, many more reasons behind. Please tracking and monitor your package when tracking is made available to you.