The first part of the meaning of life, is to build a personality with strong values. Values that are worth defending.
Use them to choose a direction, stick with it and make it a succes. Challenge the cultural background and make decisions on personal experience. Keep what works and improve it. Defend your decisions if they are attacked.
So the first part is to become a personality, improve yourself over time and defend yourself if necessary.
But there is a second part.
Where you have to realise that your values are not universal. They always depend on the context. And as important as they are to become a strong and independent individual, some day you have to realise that it is all relative.
This is where time comes in.
If the realisation is there too soon, it might harm the building process of your self. And make you paralysed, unfocused and directionless.
So a strong belief in your own values is important. Even more, the stronger it is, the more powerful the realisation of a world beyond can be, when the moment is there.