Do our attempts have some extend?

There is a limit for anything. If you want to achieve your cherished goals, you should give time to achieve your goals. I want to drive home my point with an example.

A Mother has to wait for 9 months to conceive a child.

 A child has to wait for some time to reach maturity.

At he same time, I agree that there are aspects which  need some time to take shape. There is no meaning in waiting till eternity. As an example, it took many years for me to become an accomplished Artist. But I succeeded. Had i not succeeded  by any chance, I would have chosen another field. Hence I conclude, there is limit for everything and if one thing fails, another thing should be given another try to achieve something worthwhile.

Before we set some goals, short term or long term, we should be conscious of a definite time frame and act within that time limit. Otherwise our efforts will be scattered and will not be powerful. Once we reach the time limit, the validity of the project ends, irrespective of whether we succeed or not; and there is no meaning in trying further. Our role is to try our best, without retreating in the middle.

I would say regarding friendship, time cannot be unlimited unless and until the other friend maintaining a decent silence or never indicating an insult through his/her attitude. If a friend indicates insult and disrespect even through indirect way the time instantly ends there. Friendship can face some misunderstanding but if any of the friend tries to insult another then there remains no scope to revive that very friendship. So, for me we need to try to keep every relationship remain positive until self respect gets diluted. If it happens then it's all over. 

In most cases, age is the deciding factor. In some cases, time is the deciding factor.  You cannot apply for some jobs after a certain age which means you are overaged. Also there is some appropriate age for marriage. Marrying after certain age, say 30 years is bizarre. Even though some may marry even at eighty, this is exception and neednot be treated as a rule.  

I think it depends on a particular job, one cannot keep trying once the importance of your efforts has lost its value.

It depends on the situation and the context. There are certain things where there is a tag of time limit and expiry date. You have limited attempts to qualify certain exams and competitions. There is age limit to it too. There is a limit to your attempt to enhance your career as it has span too and you have to go with  calculated move. But certain things are timeless and those are real beautiful assets of life. You have to invest in them regularly  - your time, faith and love. Only on your death bed can you evaluate and asses those assets- How happy was your married life, How well bonded were you with your children.....?? The dynamics of life and relations woven around it change and we have to actively keep investing and put our efforts to make them work beautifully. This attempt to enhance the beauty of life ends with our breath

Wel, fixing time is the best thing so that we will have some concern that we need to reach that time with perfect result or else we become lazy and we will think ok we will do later and time goes on but there will be no result.

I think time frame is very important to keep in any things, that will make our progress better and make us more happier and healthier.

There is a time for everything after which it loses its relevance, so it is better to have s timeframe, so that you move on if and when things don't work out or give the expected results