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If I have a P-channel mosfet and I want it to operate with Vgs much more than absolute maximum ratings what's the best solution which can I do? I thought that a zener between gate and source might be a good solution but, if I go through this what would be happened if the zener does not start to conduct immediately and the mosfet receive the whole amount of voltage even for a few micro seconds until the zener starts to conduct?
The mosfet is intended for reverse polarity protection.
The zener will work fine, and it's a commonly-used solution. You'll be driving the zener+gate through a resistor that limits the current to a safe level for the zener, and that resistance, together with the capacitance of the zener and the MOSFET, will act as a low-pass filter that helps protect against fast transients.
