How long to travel to Mars from the point of view of those traveling?

I've heard that it will take roughly 9 months to travel to Mars. But, time travels faster when farther away from large gravitational fields. How long will it take from the point of view of an astronaut making the trip? What will be the maximum difference in the speed of time from an astronaut on the journey from the speed of time at mission control on earth?

actually if you only considered time dilatation due to gravity, the clocks on earth would be slower than clocks on a spacecraft which is not in the gravity well of earth

However in this case, time dilation due to speed will be present so the net effect will be that the clocks on the spacecraft will be slower than that on earth.

Escape velocity from earth is 11.186 km/s. Lets be generous and say the space ship can go 10x that. Using the calculations from the website below, time dilatation factor would be 1.0000000696110642 times slower. If i calculate correctly, you lose 2 point something seconds a year

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