Use of undefined constant HOURS_IN_SECONDS

I'm getting entries in my error log for Membership2

Use of undefined constant HOURS_IN_SECONDS - assumed 'HOURS_IN_SECONDS' in /wp-content/plugins/membership/app/model/class-ms-model-communication.php on line 1076

i believe the correct constant is 'HOUR_IN_SECONDS' (singular hour)

app/model/class-ms-model-communication.php
line 1076 should be:
HOUR_IN_SECONDS