diff --git a/inc/ocf_cache.h b/inc/ocf_cache.h
index 098e1d3..dc96487 100644
--- a/inc/ocf_cache.h
+++ b/inc/ocf_cache.h
@@ -53,7 +53,7 @@ struct ocf_cache_info {
 		 * out of WB mode
 		 */
 
-	uint32_t dirty_for;
+	uint64_t dirty_for;
 		/*!< How long there are dirty cache lines (in seconds) */
 
 	ocf_cache_mode_t cache_mode;
diff --git a/inc/ocf_core.h b/inc/ocf_core.h
index 1dec9ee..4c75c55 100644
--- a/inc/ocf_core.h
+++ b/inc/ocf_core.h
@@ -32,7 +32,7 @@ struct ocf_core_info {
 	};
 
 	/** How long core is dirty in seconds unit */
-	uint32_t dirty_for;
+	uint64_t dirty_for;
 
 	/** Sequential cutoff threshold (in bytes) */
 	uint32_t seq_cutoff_threshold;
diff --git a/src/metadata/metadata.c b/src/metadata/metadata.c
index 4874a13..271d01d 100644
--- a/src/metadata/metadata.c
+++ b/src/metadata/metadata.c
@@ -1192,8 +1192,9 @@ static void _recovery_rebuild_cline_metadata(ocf_cache_t cache,
 		env_atomic_inc(&core->runtime_meta->dirty_clines);
 		env_atomic_inc(&core->runtime_meta->
 				part_counters[part_id].dirty_clines);
-		env_atomic64_cmpxchg(&core->runtime_meta->dirty_since,
-				0, env_get_tick_count());
+		if (!env_atomic64_read(&core->runtime_meta->dirty_since))
+			env_atomic64_cmpxchg(&core->runtime_meta->dirty_since, 0,
+					env_ticks_to_secs(env_get_tick_count()));
 	}
 }
 
diff --git a/src/ocf_cache.c b/src/ocf_cache.c
index 666cea3..f91253e 100644
--- a/src/ocf_cache.c
+++ b/src/ocf_cache.c
@@ -57,11 +57,11 @@ ocf_cache_mode_t ocf_cache_get_mode(ocf_cache_t cache)
 	return cache->conf_meta->cache_mode;
 }
 
-static uint32_t _calc_dirty_for(uint64_t dirty_since)
+static uint64_t _calc_dirty_for(uint64_t dirty_since)
 {
-	return dirty_since ?
-		(env_ticks_to_msecs(env_get_tick_count() - dirty_since) / 1000)
-		: 0;
+	uint64_t current_time = env_ticks_to_secs(env_get_tick_count());
+
+	return dirty_since ? (current_time - dirty_since) : 0;
 }
 
 int ocf_cache_get_info(ocf_cache_t cache, struct ocf_cache_info *info)
diff --git a/src/ocf_core.c b/src/ocf_core.c
index 075ebdb..3983e5c 100644
--- a/src/ocf_core.c
+++ b/src/ocf_core.c
@@ -147,11 +147,11 @@ int ocf_core_visit(ocf_cache_t cache, ocf_core_visitor_t visitor, void *cntx,
 
 /* *** HELPER FUNCTIONS *** */
 
-static uint32_t _calc_dirty_for(uint64_t dirty_since)
+static uint64_t _calc_dirty_for(uint64_t dirty_since)
 {
-	return dirty_since ?
-		(env_ticks_to_msecs(env_get_tick_count() - dirty_since) / 1000)
-		: 0;
+	uint64_t current_time = env_ticks_to_secs(env_get_tick_count());
+
+	return dirty_since ? (current_time - dirty_since) : 0;
 }
 
 static inline struct ocf_request *ocf_io_to_req(struct ocf_io *io)
diff --git a/src/utils/utils_cache_line.c b/src/utils/utils_cache_line.c
index bf97df4..0b6a837 100644
--- a/src/utils/utils_cache_line.c
+++ b/src/utils/utils_cache_line.c
@@ -157,8 +157,10 @@ void set_cache_line_dirty(struct ocf_cache *cache, uint8_t start_bit,
 			/*
 			 * If this is first dirty cline set dirty timestamp
 			 */
-			env_atomic64_cmpxchg(&req->core->runtime_meta->dirty_since,
-					0, env_get_tick_count());
+			if (!env_atomic64_read(&req->core->runtime_meta->dirty_since))
+				env_atomic64_cmpxchg(
+					&req->core->runtime_meta->dirty_since, 0,
+					env_ticks_to_secs(env_get_tick_count()));
 
 			/*
 			 * Update the number of dirty cached data for that
diff --git a/tests/functional/pyocf/types/stats/cache.py b/tests/functional/pyocf/types/stats/cache.py
index b57ea21..d4ef4ff 100644
--- a/tests/functional/pyocf/types/stats/cache.py
+++ b/tests/functional/pyocf/types/stats/cache.py
@@ -24,7 +24,7 @@ class CacheInfo(Structure):
         ("occupancy", c_uint32),
         ("dirty", c_uint32),
         ("dirty_initial", c_uint32),
-        ("dirty_for", c_uint32),
+        ("dirty_for", c_uint64),
         ("cache_mode", c_uint32),
         ("fallback_pt", _FallbackPt),
         ("state", c_uint8),
diff --git a/tests/functional/pyocf/types/stats/core.py b/tests/functional/pyocf/types/stats/core.py
index f02b72d..1ba4bab 100644
--- a/tests/functional/pyocf/types/stats/core.py
+++ b/tests/functional/pyocf/types/stats/core.py
@@ -15,7 +15,7 @@ class CoreInfo(Structure):
         ("core_size_bytes", c_uint64),
         ("dirty", c_uint32),
         ("flushed", c_uint32),
-        ("dirty_for", c_uint32),
+        ("dirty_for", c_uint64),
         ("seq_cutoff_threshold", c_uint32),
         ("seq_cutoff_policy", c_uint32),
     ]