howto use the attribute of "Access-Period"

[Spacelee]

I set the value to 3600, but it says
[sql]     expand: SELECT id, username, attribute, value, op           FROM
radcheck           WHERE username = '%{SQL-User-Name}'           ORDER BY id
-> SELECT id, username, attribute, value, op           FROM
radcheck           WHERE username = 'test'           ORDER BY id
rlm_sql: Failed to create the pair: Invalid octet string "3600" for
attribute name "Access-Period"

-- 
Spacelee
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