[sammyg2]

A couple things to consider:

a non intercooled turbo engine will make normal boost for a little while, until the entire intake tract develops heat soak. That is when the pipes etc. lose their ability to absorb heat because that are already hot. At that time, the boost charge temperature continues to climb above acceptable levels. That is not good for an engine.

Now lets look at an intercooled turbo.
The engine develops boost for a long time. If the intercooler is not up to the task, heat soak can again happen (stock intercooler).
With a larger aftermarket intercooler, the efficiency of the cooling can keep up with it and continue to cool the boost charge. unfortunately, most people who install an aftermarket intercooler also increase the boost pressures.
So..... assuming the oil cooling system is up to the challenge, the answer would be that if the boost levels are matched with the sustained intercooler efficiency you could maintain redline under boost.
Clear as mother's milk.