When you say ‘update is set to 0’ do you mean this field? We would not recommend it to be so low (besides as I said player will get updated version depending on it’s collection interval anyway)
When you edit text in the region in designer it will be updated instantly in the CMS (same when you edit row/column of dataset in library - dataset).
But I would imagine that you will want to send this layout to the player (Windows/Android client), right?
When the layout is playing in the client, and you make changes to this layout in CMS, player will show updated version depending on the region with the longest duration that you have on your layout and collection interval of the player - which is set in the display profile.
You may want to have a look here too: