He didn't ask for advice. He asked for numbers. Then a bunch of people, including you, gave unsolicited advice instead of answering his question. Only one person (Nick) apparently didn't feel it was beneath them to just answer the damn question.

So you certainly fit in here. Let's hope the OP doesnt

Not sure but I use a Bontrager speed bottle on mine. Am used to it now and I think it is more aero than a round bottle in the same place.
I don't have a time in seconds answer for you unfortunately. But if you are going ot use a bottle there and are worried about aero, you could try an aero bottle.
It comes with a carbon cage so that's also good.

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Swim with swimmers, bike with cyclists, run with runners. Train with those who are hard to keep up with. Soon you will be hard to keep up with.

Lucky for you I was at A2 for 2 hours yesterday on a Shiv Tri.

My baseline was a bottle between the aero bars and a bottle on the seat tube. Taking the bottle off of the seat tube saved me 6/7 watts at 0/-10 yaw.

Removing the bottle from between the aerobars made no difference at 0 yaw and saved 2 more watts at -10 yaw.

These wattages are aero watts at 25mph. Using 30mph would give you an even higher number.

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Race Reports, etc -- Bob's Bikes