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I don't think it is worthwile to increase the glow period unless you have trouble starting your car. And in such case something probably is wrong with it.
In my car there 3 things to consider when talking abour glowplugs: pre-start, afterglow and coolant plugs.
The table you posted refer to the time the plugs glow to warm up the chamber a bit. But depending on the temperature, the plugs will continue to glow after the engine is started to help it run smoother when it's really cold. Ideally if you don't mind the engine caughing and clacking a little you could reduce the afterglow. And then there are the coolant plugs, on my car there are 3 which warm the coolant up faster, I unplug them all the time but when I don't have access to plug my block heater.
I think external warming solutions are the best option.
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