whatever you say, caveat it with a risks, constraints and assumptions and put an appropriate dissclaimers in with the estimate eg that this is an approxiamate p

whatever you say, caveat it with a risks, constraints and assumptions and put an appropriate dissclaimers in with the estimate eg that this is an approxiamate plan and it will be subject to change etc.. The number of times that I've been tried to be held accountable for guesstimates is just not funny