These always appear to differ slightly. Here is some data I pulled yesterday from an example agent.
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Agent Time Detail (/vicidial/AST_agent_time_detail.php?)
279 calls 3:02:46 Talk Time
(Note: 5:53 dead time)
User Stats (/vicidial/user_stats.php?)
279 calls 3:06:02 Talk Time
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I did scan some previous posts (see below). In the bottom one, Matt points out that Talk Time includes customer time and dead time. But simply adding dead time to the Agent Time Detail number never quite equalizes these two Talk Times either. Thanks for any guidance.

viewtopic.php?f=4&t=42257&p=154091&hilit=talk+time#p154091
viewtopic.php?f=2&t=41741&p=151614&hilit=talk+time#p151614
viewtopic.php?f=4&t=41490&p=150375&hilit=talk+time#p150375
viewtopic.php?f=4&t=41493&p=150295&hilit=talk+time#p150295
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