diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87d8c82db3..a843f4839b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#4680](https://github.com/thanos-io/thanos/pull/4680) Query: add `exemplar.partial-response` flag to control partial response.
 - [#4679](https://github.com/thanos-io/thanos/pull/4679) Added `enable-feature` flag to enable negative offsets and @ modifier, similar to Prometheus.
 - [#4696](https://github.com/thanos-io/thanos/pull/4696) Query: add cache name to tracing spans.
+- [#4764](https://github.com/thanos-io/thanos/pull/4764) Compactor: add `block-viewer.global.sync-block-timeout` flag to set the timeout of synchronization block metas.
 
 ### Fixed
 
diff --git a/cmd/thanos/compact.go b/cmd/thanos/compact.go
index 2ae488de6d..b4ff8f5690 100644
--- a/cmd/thanos/compact.go
+++ b/cmd/thanos/compact.go
@@ -537,14 +537,14 @@ func runCompact(
 		}
 
 		g.Add(func() error {
-			iterCtx, iterCancel := context.WithTimeout(ctx, conf.waitInterval)
+			iterCtx, iterCancel := context.WithTimeout(ctx, conf.blockViewerSyncBlockTimeout)
 			_, _, _ = f.Fetch(iterCtx)
 			iterCancel()
 
 			// For /global state make sure to fetch periodically.
 			return runutil.Repeat(conf.blockViewerSyncBlockInterval, ctx.Done(), func() error {
 				return runutil.RetryWithLog(logger, time.Minute, ctx.Done(), func() error {
-					iterCtx, iterCancel := context.WithTimeout(ctx, conf.waitInterval)
+					iterCtx, iterCancel := context.WithTimeout(ctx, conf.blockViewerSyncBlockTimeout)
 					defer iterCancel()
 
 					_, _, err := f.Fetch(iterCtx)
@@ -576,6 +576,7 @@ type compactConfig struct {
 	blockSyncConcurrency                           int
 	blockMetaFetchConcurrency                      int
 	blockViewerSyncBlockInterval                   time.Duration
+	blockViewerSyncBlockTimeout                    time.Duration
 	cleanupBlocksInterval                          time.Duration
 	compactionConcurrency                          int
 	downsampleConcurrency                          int
@@ -634,6 +635,8 @@ func (cc *compactConfig) registerFlag(cmd extkingpin.FlagClause) {
 		Default("32").IntVar(&cc.blockMetaFetchConcurrency)
 	cmd.Flag("block-viewer.global.sync-block-interval", "Repeat interval for syncing the blocks between local and remote view for /global Block Viewer UI.").
 		Default("1m").DurationVar(&cc.blockViewerSyncBlockInterval)
+	cmd.Flag("block-viewer.global.sync-block-timeout", "Maximum time for syncing the blocks between local and remote view for /global Block Viewer UI.").
+		Default("5m").DurationVar(&cc.blockViewerSyncBlockTimeout)
 	cmd.Flag("compact.cleanup-interval", "How often we should clean up partially uploaded blocks and blocks with deletion mark in the background when --wait has been enabled. Setting it to \"0s\" disables it - the cleaning will only happen at the end of an iteration.").
 		Default("5m").DurationVar(&cc.cleanupBlocksInterval)
 
diff --git a/docs/components/compact.md b/docs/components/compact.md
index ce1a796b36..8b662a88e7 100644
--- a/docs/components/compact.md
+++ b/docs/components/compact.md
@@ -284,6 +284,10 @@ Flags:
                                 Repeat interval for syncing the blocks between
                                 local and remote view for /global Block Viewer
                                 UI.
+      --block-viewer.global.sync-block-timeout=5m  
+                                Maximum time for syncing the blocks between
+                                local and remote view for /global Block Viewer
+                                UI.
       --bucket-web-label=BUCKET-WEB-LABEL  
                                 Prometheus label to use as timeline title in the
                                 bucket web UI