
Understanding time management and deep calculations in classical chess
Hey, I am going to play my first classical chess tournament ever in 10 days. I am 1900 rated on rapid on chess.com and I have played rapid OTB tournaments before. But now I will play an actual classical tournament (90+30).
I am too used of playing rapid chess and cannot really see myself calculating a move for 20 minutes or more. Today I played some 30+20 on lichess and it already felt slightly too long. Every time I calculated several variations and really tried to spend my time, I had only calculated for 5-10 minutes max. I really feel that, when I think for long, I lose my train of thought and spiral remembering the moves and variations I had calculated.
What am I missing? How should I think while playing classical chess? Thank you