site/docs/3.5/cmds/time.html
time COMMAND
time causes fish to measure how long a command takes and print the results afterwards. The command can be a simple fish command or a block. The results can not currently be redirected.
For checking timing after a command has completed, check $CMD_DURATION.
Your system most likely also has a time command. To use that use something like command time, as in command time sleep 10. Because it’s not inside fish, it won’t have access to fish functions and won’t be able to time blocks and such.
(for obvious reasons exact results will vary on your system)
\>\_ time sleep 1s\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_Executed in 1,01 secs fish external usr time 2,32 millis 0,00 micros 2,32 millis sys time 0,88 millis 877,00 micros 0,00 millis\>\_ time for i in 1 2 3; sleep 1s; end\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_Executed in 3,01 secs fish external usr time 9,16 millis 2,94 millis 6,23 millis sys time 0,23 millis 0,00 millis 0,23 millis
Inline variable assignments need to follow the time keyword:
\>\_ time a\_moment=1.5m sleep $a\_moment\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_Executed in 90.00 secs fish external usr time 4.62 millis 4.62 millis 0.00 millis sys time 2.35 millis 0.41 millis 1.95 millis