Hot start problems in a CIS system as described are caused by a fuel pressure drop.
In this case its caused by a old and leaky fuel accumulator ,simply replace this and all the hot starts will be perfect with no waiting.

The fuel accumulator is mounted next to the fuel pump and fuel filter . At one cend connecting to the fuel system andd at the opposite end will be a vaccuam pipe connection. leaked fuel accumulates here as you will be able to check.
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