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@gbj_tester
Depends how long the piece of string is.
From my own rides at the tail end of the 2011 season on the Shurlock Row course, 24:32 on the TT bike and 27:01 on the track bike under 'old school' rules, so no deep wheels or tribars and also road jersey instead of skinsuit. I may have been a bit undergeared on the track bike. With a skinsuit on, I did 25:04 on the H10/2 on the track bike, against 23:43 on the previous outing on that course on the TT bike. As well as all the aero differences, those track bike rides were done on Vittoria Diamante/butyl tubes, which are a bit agricultural compared with the Vittoria UltraSpeed/latex tubes which were on my TT wheels at the time.
10 mile comp record has only come down by 51s from 18:48 by Colin Sturgess on a road bike to 17:57 by Dr. Hutch, who has probably spent as much time in the tunnel as any pro refining his equipment selection (including socks) and position.
If your road bike as a Cervelo S5 with Zipp 404FCs and your shoulders don't move between riding on the hoods on the road bike and being on the tribars of the TT bike, the gain could be much smaller than any of the above examples. OTOH, if you move from a fat tubed aluminium air brake with Mavic R-Sys onto one of the UCI-illegal tri bikes and gain acres of CdA from a change of position while you're at it, you might see a speed gain even bigger than the 10% illustration above.