RADIUS attribute from rfc2866

---

Acct-Delay-Time

This attribute indicates how many seconds the client has been
      trying to send this record for, and can be subtracted from the
      time of arrival on the server to find the approximate time of the
      event generating this Accounting-Request.  (Network transit time
      is ignored.)

      Note that changing the Acct-Delay-Time causes the Identifier to
      change; see the discussion under Identifier above.

   A summary of the Acct-Delay-Time attribute format is shown below.
   The fields are transmitted from left to right.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |    Length     |             Value
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont)         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+Type

      41 for Acct-Delay-Time.

   Length

      6

   Value

      The Value field is four octets.

---