Is that after you have asked for the original estimate?
We (non maestro) work out untouched landing time. Gives us the landing sequence. Work out landing time to make sequence work, then work out time at feeder fix to make good the landing time. Only give a fix time that requires a slow up, we don't rely on max giving us anything, except in a very few cases.
Our original estimate for fix A is 43. Needs to lose 2 mins, so instruct to cross at time 45. Pilot says he can't get there til 47, despite our estimates showing he should be there at 43, so we issue cross not before 45 and they always seem to turn up at time 45 despite their original estimate of time 47.