It depends how they prep it. Simply replacing the verge fillet with fresh mortar will last for decades. Sticking plastic over the end and screwing into duff mortar won't last a few months. See it all the time. It's the tarmac crew doing the job.
For that price, they are probably not removing the verge, just over cladding. The problem with this is that there needs to be some sound lath to fix to.
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