How do I make minimum digits condition?

I have a text box where digits are required to be entered. A button uses the condition "On text changed" to be created. How do I create a condition for the button to appear only if at least 6 digits are entered in this text box?

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System: len(TextBox.Text) > 6 - do your actions

works great. thank you!

now I am trying to enter a subevent saying -

if text is less than 6 set button invisible, but the button becomes invisible exactly after I eneter the first digit. How do I combine these two conditions?

Edit: Looks like dropbox have some issues currently so

+ System: len(TextBox.Text) > 6
  + Trigger once   ->  Button: Set Visible

+ Else
+ Trigger once     ->  Button: Set Invisible[/code:3c77qyyn]

this looks and works soooo nice!

thank you!

now I know even more about c2