Set a single reminder on all week days

I found the params I missed : every weekday

Answer :

/remind @channel "It's time for daily stand up !" every weekday at 11:45am

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Edit : Slack Help Center has been updated and now contains tons of reminders examples with parameters !

You can also list them:

/remind @channel "It's time for daily stand up !" at 11:45am every Monday, Tuesday, Wednesday, Thursday and Friday

however if you run /remind list, you can find out that it is visible as simplified:

Remind @channel “It's time for daily stand up !” at 11:45 every weekday