In the admin console, for any of the numbers with attached time units that have units of Minutes, Hours or Days, if you set the value to a time not divisible by 60 it will display that number of Minutes instead of Seconds. Setting the value to a non-divisible number is possible through the Rest Admin console.

For example, if I run:
bin/kcadm.sh get realms/demo > demorealm.json
jq '.ssoSessionIdleTimeout=100' demorealm.json > newdemorealm.json
bin/kcadm.sh update realms/demo -f newdemorealm.json
(you can edit the ssoSessionIdleTimeout by hand also)

It will show in the display as 100 Minutes when it's actually interpreted as 100 Seconds. Either prevent the setting of values that it can't display or change the display to handle seconds.