Jake McCrary is a software developer who writes about Clojure, testing, developer tooling, and distributed work.
HN commenters link his post on showing the last command's run time in a bash prompt as a practical tip.
I do that, if it's over 60 seconds - it's not as straightforward since you also need to use PROMPT_COMMAND, a debug trap, and a variable to store the start time: https://jakemccrary.com/blog/2015/05/03/put-the-last-commands-run-time-in-your-bash-prompt/