Below is a chart from my hull survey.
In this scenario I want to imagine things are as bad as they can possibly be.
The boat is in mooring and does not leave the marina.
Water is present between the over plating and the original hull,
The mooring electricity is badly wired and electricity is leaking in to the canal.
The weather has been terrible, it is Winter and the river continues to freeze and thaw
The boat next to me is used a lot and every time they moor up they crash in to my boat.
How long can my boat last???