[Service]
Type=oneshot
-Environment= MDADM_CHECK_DURATION='"6 hours"'
+Environment= MDADM_CHECK_DURATION="6 hours"
EnvironmentFile=-/run/sysconfig/mdadm
ExecStartPre=-/usr/lib/mdadm/mdadm_env.sh
-ExecStart=/usr/share/mdadm/mdcheck --duration $MDADM_CHECK_DURATION
+ExecStart=/usr/share/mdadm/mdcheck --duration ${MDADM_CHECK_DURATION}