[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 --continue --duration ${MDADM_CHECK_DURATION}