RADIUS Attribute - Acct-Session-Time
As per RFC 2866
This attribute indicates how many seconds the user has received service for, and can only be present in Accounting-Request records where the Acct-Status-Type is set to Stop. A summary of the Acct-Session-Time attribute format is shown below. The fields are transmitted from left to right.
Type (IETF Number) = 46 for Acct-Session-Time.
Length = 6
Value = The Value field is four octets.