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@yetidamo
My course PB's on the sporting course we used for our weekly club events when I raced (Q10/22 Harrietsham):
TT bike, disc, deep section front, aero lid, skin suits etc: 21:43
Road bike with zero aero aids: 23:16
Ridden it a fair bit so know the course very well which helps, but I reckon it's about right to answer your question for a 10.