What was your biggest reality check after tracking your daily time spend?

I spent weeks convinced I was spending most of my day writing code and talking to customers. Decided to log everything in a sheet for a month, and the numbers proved I was completely lying to myself.

Half my time went to emails, organizing task boards, and watching tutorials I didn't need yet.

Has anyone here confronted bad time habits with real data? Curious what changes you made that actually stuck.