Changing the Past. A Remarkable Gift if Done Properly.

The longer something occurs the harder it would be to change. That goes for time travel as well. The theory is that if I can go back in time in short packets such as twenty minutes or a day or two, then changing the past to alter the future is incredible. How many times have you caught yourself saying "I should have said that". If travelled back in time to say that thing you wish you have said, it would have practically no alteration of the future except for the satisfaction of you saying what you wish you had said. Or you wish you did not say something. Well if the time you said something you wish you never said was not very long ago, then changing time is nothing. However, if one was to travel back in time to change a historic event or to just change one small little thing, the world in the present would completely different altogether. So it all has to do with relativity. If you change something that was say 20 minutes to a day or two, then there is practically no change whatsoever. If you change something in the past about 5+ years ago then alterations of the future could possibly catastrophic. Changing the past is a gift if it you use it to change things that are happening to you in the present but changing the past is a curse if you change something from a long time ago; the present alterations would be jurassic and your life as you know it, wouldnt anything like you knew it was.