First Add reference from Network List Manager 1.0 Type Library
var manager = new NetworkListManager();
var connectedNetworks = manager.GetNetworks(NLM_ENUM_NETWORK.NLM_ENUM_NETWORK_CONNECTED).Cast<INetwork>();
foreach (var network in connectedNetworks)
{
if (network.IsConnected)
{
network.GetTimeCreatedAndConnected(out uint _, out uint _, out uint
pdwLowDateTimeConnected, out uint pdwHighDateTimeConnected);
DateTime networkConnectedTime = DateTime.FromFileTimeUtc((long)
(((ulong)pdwHighDateTimeConnected << 32) | pdwLowDateTimeConnected));
TimeSpan diff = DateTime.Now.Subtract(networkConnectedTime);
Console.WriteLine("Name: " + network.GetName() + " Duration : {0} day(s) {1}:{2}:{3}", diff.Days, diff.Hours, diff.Minutes, diff.Seconds);
}
}
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