Server=server;Database=database;Uid=username;Pwd=password;Default Command Timeout=60
Reference:
Update 12/3/2019
The above didn't work somehow on our ASP.NET application that used EntityFramework, so we have to specify it in our ApplicationDbContext constructor and increase it to 5 minutes (300s). The following is the VB.NET version:
Public Sub New(existingConnection As Common.DbConnection, contextOwnsConnection As Boolean)
MyBase.New(existingConnection, contextOwnsConnection)
Database.CommandTimeout = 300
End Sub