London

Hi! I´m planning go to London if is possible in the next month, I only will have four days free in the work for go but a lot of people have said me that it´s a few days, because in London you need six o seven days at least for can to see very well the city. What do you think? Should I try to have more days? I am three months planning this trip and now I am a little sad by this....Is really not enough time? :(