Index: sys/dev/hyperv/utilities/hv_snapshot.c
===================================================================
--- sys/dev/hyperv/utilities/hv_snapshot.c
+++ sys/dev/hyperv/utilities/hv_snapshot.c
@@ -70,6 +70,8 @@
 #define VSS_FWVER		VMBUS_IC_VERSION(VSS_FWVER_MAJOR, 0)
 
 #define TIMEOUT_LIMIT		(15)	// seconds
+#define VSS_FREEZE_TIMEOUT	(15 * 60)	// seconds
+
 enum hv_vss_op {
 	VSS_OP_CREATE = 0,
 	VSS_OP_DELETE,
@@ -778,7 +780,8 @@
 			hv_vss_notify(&sc->app_sc, reqp);
 		else
 			hv_vss_notify(&sc->daemon_sc, reqp);
-		callout_reset(&reqp->callout, TIMEOUT_LIMIT * hz,
+		callout_reset(&reqp->callout, opt == VSS_OP_FREEZE ?
+		    VSS_FREEZE_TIMEOUT * hz : TIMEOUT_LIMIT * hz,
 		    hv_vss_timeout, reqp);
 		break;
 	case VSS_OP_THAW: