ApplicationInsigth dependencies type HttpOutboundCall duration

Hi, I have a problem, When I see the log from dependencies table, type HttpOutboundCall, the duration collumn is always lest, than the trace from mi c# application.

In code, I have a HttpRequest, and count the elapsed time, but, it is hier than the log in Application insigth

Example, in App Insigth

And, in the application, the time elapsed is 4059 ms, but in application insigth, the maximun is 1355 ms