I have to create job that does some stuff. The job's repeat interval is configurable. The problem is that the interval can set up from 15 up to 120 minutes with a step of 15. We use Hangfire on our site and it is already running a bunch of other jobs. Hangfire uses CRON expressions, which can't take more than 59 minutes as far as I know. How can make Hangfire execute a job every 75, 90 etc. minutes?