Merge pull request #287906 from flang-msft/fxl---improve-time-to-scale-language--WI-28872436

fxl---updated scale time language

Author: prmerger-automator[bot]

articles/azure-cache-for-redis/cache-how-to-scale.md

@@ -369,7 +369,9 @@ Scaling time depends on a few factors. Here are some factors that can affect how
 - High write requests: Higher number of writes mean more data replicates across nodes or shards
 - High server load: Higher server load means the Redis server is busy and limited CPU cycles are available to complete data redistribution
 
-Generally, when you scale a cache with no data, it takes approximately 20 minutes. For clustered caches, scaling takes approximately 20 minutes per shard with minimal data.
+Scaling a cache is non-trivial action and can take a long time.
+
+Based on real world examples, the time to scale cache with one to two shards can be 1 to 2 hours when the cache is not under heavy loads.If you have more shards, the time to scale doesn't increase in a linear way.
 
 ### How can I tell when scaling is complete?