diff --git a/s3/s3.go b/s3/s3.go
index ba607b1954159fb147b59abaf46d5e178b303135..1aa35c03c176edf9dfd1227d5d5361a6c673fc76 100644
--- a/s3/s3.go
+++ b/s3/s3.go
@@ -38,6 +38,12 @@ type S3UploadSettings struct {
 	FileExt                   string // Required when GenerateFileNameFromParts is true
 }
 
+// Duration constants
+const (
+	S3ExpiryDuration1Day  time.Duration = 24 * time.Hour
+	S3ExpiryDuration7Days time.Duration = 7 * 24 * time.Hour
+)
+
 type MIMEType string
 
 const (