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If they haven't tamped it thoroughly,
(knocking all the tiny air pockets out of),
the cement/fine sand/water slurry that coated the gravel,
will be prone to waterlogging in steady rain.
The next night of frost should see some freeze/thaw cracking.That's before we consider the negligible bond strength between
cementitious and bituminous systems.Expect the feathered edges to go with the refuse hgv.
Cheapest sand/gravel/cement available.
How long do we give this? We get a municipal refuse lorry roughly once per week that will drive over this.