Mercury has not done any endurance testing yet.
So it would be hard to give you a straight answer.
They did the same thing when they came out with the
1025 or was it 1050?........Which is now the 1075.
First year or so was sorting it out and eventually became
the 1075 and a good engine.
Down side was it killed the sales or there engine package the used to have in the 900 hp area cause every one wanted the 1075.
Seems like it would have been smarter to get it sorted out first in secrecy or race teams only and continue the sale on there 900 ish.....Until a new product can be ready for public use.
Anyways hope that helps with your question.