My approach to practicing has to adapt to deadlines. Sometimes the deadlines come up fast, and there isn’t time to make everything as perfect as I would like. Other times I have plenty of preparation time and want to make the best use of it.
Suppose the music I’m working on has one or two especially challenging spots, and I know I could put many hours into trying to perfect them. If I get bogged down trying to make those couple of spots perfect on a tight deadline, I might fail to adequately prepare the rest. It’s a better strategy to make sure I’m ready to play 98% of the music at tempo, make a reasonable effort with the remaining 2%, and hope for the best.
But if I have plenty of time to prepare, that approach can backfire. Getting the 2% “good enough” early in the process may mean compromises that I have to undo later. I’ll have a better final result if I’m not in a hurry to bring the tough spots up to standard. Instead, I give them time to settle deeply into muscle memory before pushing the tempo. I practice difficult spots for a few minutes every day, instead of cramming.
Think carefully about your practice approach, and adapt as needed. Good luck!