Run watcher every 90 minutes with cron

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1

Trying to adjust a cron to run every 90 min. It was previously running every 20 min, which was :

0 0/20 * * * ? whatever

How can i do the same things with 90min ?

2

That will not work I think.. Check this, crontab.guru is really handy

3

0 0/90 * * * is doesn't work !
the valid values are : 0-59 !

4

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