zsh automatically report time stats for long processes

export REPORTTIME=60

Setting the variable REPORTTIME to a value greater than zero will make ZSH automatically print execution times after the command finishes.

If nonzero, commands whose combined user and system execution times (measured in seconds) are greater than this value have timing statistics printed for them.

http://zsh.sourceforge.net/Doc/Release/Parameters.html#index-REPORTTIME