diff --git a/.rr.yaml b/.rr.yaml
index 5bf290c3c..b5febff10 100644
--- a/.rr.yaml
+++ b/.rr.yaml
@@ -495,7 +495,7 @@ service:
 
     # Allowed time before stop.
     #
-    # Default: 0 (infinity), can be 1s, 2m, 2h (seconds, minutes, hours)
+    # Default: 0 (infinity), can be 1s, 2m, 2h (seconds, minutes, hours) and complex 2h2m1s.
     exec_timeout: 0s
 
     # Show the name of the service in logs (e.g. service.some_service_1)
@@ -547,7 +547,7 @@ service:
 
     # Allowed time before stop.
     #
-    # Default: 0 (infinity), can be 1s, 2m, 2h (seconds, minutes, hours)
+    # Default: 0 (infinity), can be 1s, 2m, 2h (seconds, minutes, hours) and complex 2h2m1s.
     exec_timeout: 0s
 
     # Remain process after exit. In other words, restart process after exit with any exit code.
@@ -1930,6 +1930,7 @@ grpc:
   #	zero or the connection establishment.
   #
   # This option is optional. Default value: infinity.
+  # Can be 1s, 2m, 2h (seconds, minutes, hours) and complex 2h2m1s.
   max_connection_idle: 0s
 
   # MaxConnectionAge is a duration for the maximum amount of time a
@@ -1938,11 +1939,13 @@ grpc:
   #	connection storms.
   #
   # This option is optional. Default value: infinity.
+  # Can be 1s, 2m, 2h (seconds, minutes, hours) and complex 2h2m1s.
   max_connection_age: 0s
 
   # MaxConnectionAgeGrace is an additive period after MaxConnectionAge after
   #	which the connection will be forcibly closed.
-  max_connection_age_grace: 0s8h
+  # Can be 1s, 2m, 2h (seconds, minutes, hours) and complex 2h2m1s.
+  max_connection_age_grace: 8h
 
   # MaxConnectionAgeGrace is an additive period after MaxConnectionAge after
   #	which the connection will be forcibly closed.
@@ -1955,6 +1958,7 @@ grpc:
   #	If set below 1s, a minimum value of 1s will be used instead.
   #
   # This option is optional. Default value: 2h
+  # Can be 1s, 2m, 2h (seconds, minutes, hours) and complex 2h2m1s.
   ping_time: 1s
 
   # After having pinged for keepalive check, the server waits for a duration
@@ -1962,6 +1966,7 @@ grpc:
   #	closed.
   #
   # This option is optional. Default value: 20s
+  # Can be 1s, 2m, 2h (seconds, minutes, hours) and complex 2h2m1s.
   timeout: 200s
 
   # Usual workers pool configuration
diff --git a/schemas/config/2.0.schema.json b/schemas/config/2.0.schema.json
index e3cdefeed..9971849aa 100644
--- a/schemas/config/2.0.schema.json
+++ b/schemas/config/2.0.schema.json
@@ -2232,13 +2232,16 @@
         "Duration": {
             "description": "Time duration",
             "type": "string",
-            "pattern": "^[0-9]+[ms]|[s,h]",
+            "pattern": "^([0-9]*(\\.[0-9]*)?(ms|h|m|s))+$",
             "examples": [
-                "10h",
-                "1m",
-                "1h",
-                "30s",
-                "300ms"
+				"1h",
+				"2.5h",
+				"2m",
+				".2m",
+				"30s",
+				"30.03s",
+				"300ms",
+				"1h3m40s500ms"
             ]
         },
         "HostAndPortWithTCP": {
diff --git a/schemas/config/3.0.schema.json b/schemas/config/3.0.schema.json
index 98563373b..f65e86cb8 100644
--- a/schemas/config/3.0.schema.json
+++ b/schemas/config/3.0.schema.json
@@ -2359,14 +2359,17 @@
         "Duration": {
             "description": "Time duration",
             "type": "string",
-            "pattern": "^[0-9]+[ms]|[s,h]",
+            "pattern": "^([0-9]*(\\.[0-9]*)?(ms|h|m|s))+$",
             "examples": [
-                "10h",
-                "1m",
-                "1h",
+				"1h",
+				"2.5h",
+				"2m",
+				".2m",
                 "30s",
-                "300ms"
-            ]
+                "30.03s",
+                "300ms",
+				"1h3m40s500ms"
+			]
         },
         "HostAndPortWithTCP": {
             "description": "Host and port with tcp:// prefix",
diff --git a/schemas/readme.md b/schemas/readme.md
index 534c4a781..65a8de98e 100644
--- a/schemas/readme.md
+++ b/schemas/readme.md
@@ -7,7 +7,7 @@ This directory contains public schemas for the most important parts of applicati
 - You can validate existing config file using the following command:
 
  ```bash
- $ docker run --rm -v "$(pwd):/src" -w "/src" node:14-alpine sh -c \
+docker run --rm -v "$(pwd):/src" -w "/src" node:14-alpine sh -c \
      "npm install -g ajv-cli && \
      ajv validate --all-errors --verbose \
        -s ./schemas/config/3.0.schema.json \