diff --git a/LuaLibs/AddManData.lua b/LuaLibs/AddManData.lua
index 9303e72..0ee4186 100644
--- a/LuaLibs/AddManData.lua
+++ b/LuaLibs/AddManData.lua
@@ -140,6 +140,7 @@ RESULT_READ_PROG = 'ResultReadProg'
 
 KEY_PART_ON_TABLE = 'PartOnTable'
 KEY_RESULT = 'Result'
+KEY_WAITING_TIME = 'WaitingTime'
 KEY_PALETTE = 'Palette'
 KEY_LAYER_VIEW = 'LayerView'
 KEY_SHELL_VIEW = 'ShellView'
diff --git a/LuaLibs/RunMachiningParamCalc.lua b/LuaLibs/RunMachiningParamCalc.lua
index c0e0daa..1fbc9ca 100644
--- a/LuaLibs/RunMachiningParamCalc.lua
+++ b/LuaLibs/RunMachiningParamCalc.lua
@@ -79,6 +79,8 @@ function RunMachiningParamCalc.Exec()
       while nLayerId do
          local sLayerName = EgtGetName( nLayerId)
          local nLayerIndex = tonumber( sLayerName:sub( #SLICE_LAYER + 1))
+         -- rimuovo eventuale info precedente del tempo di attesa
+         EgtRemoveInfo( nLayerId, KEY_WAITING_TIME)
          -- calcolo lunghezza totale del layer
          local dTotLayerLength = 0
          local nCrvId = EgtGetFirstGroupInGroup( nLayerId)
@@ -132,6 +134,7 @@ function RunMachiningParamCalc.Exec()
          local sStatus = ''
          if dEsteemedTime < dMinTime then
             EgtSetInfo( nLayerId, KEY_RESULT, RESULT.KO_MINUS)
+            EgtSetInfo( nLayerId, KEY_WAITING_TIME, dMinTime - dEsteemedTime)
             sStatus = 'KO(-)'
          elseif dEsteemedTime > dMinTime and dEsteemedTime < dMaxTime then
             EgtSetInfo( nLayerId, KEY_RESULT, RESULT.OK)