Okay, maybe I can help you not waste much time having to reach depth 60 by doing the bare minimum of interactive analysis. Try this:
1.- Get the PV that Stockfish dev Depth 60 shows, and play the like up to move 36. This will be "relative depth 30." Now, put your engine to analyze to depth 60 on that position.
2. There's three possible things that can happen:
A) The evaluation gets down very near 0. This meant the PV had a blunder by black somewhere and the eval from the root couldn't be trusted.
B) The evaluation will explode to the high 2.00 or more. This meant the PV had a blunder by white somewhere and the eval from the root couldn't be trusted.
C) The evaluation remains stable, so around where it is now, because of law of averages or because the moves from both side were very good.
If C happens then you'll have from this line what you'd have seen at Detph 90 from the root!
This is why I can find Stockfish's depth 60 moves in a fraction of the time and am able to play 17 correspondence chess games at this level without ever having to reach high depth. Because what matters are the moves and you can take shortcuts to find them up to move 36, not just the root position.