That's also configurable. The default setting for "mon osd down out interval" is 600 seconds. See http://docs.ceph.com/docs/master/rados/configuration/mon-osd

That's also configurable. The default setting for "mon osd down out interval" is 600 seconds. See http://docs.ceph.com/docs/master/rados/configuration/mon-osd-interaction/ http://docs.ceph.com/docs/master/rados/configuration/mon-osd... for a lot more configuration that can be done here.