In the Maha Satipattana Sutta in Digha Nikaya, the Buddha describes Success of Four Pattana Meditations as: “One who is honest to himself and practice this four Pattana Meditations without a delay, he should be willing to achieve Arahat or Anagami level, in seven days to seven years in time which would ultimately direct to Nirvana”
The Buddha said: "One who is willing to attain Nirvana, has to understand Four Noble Truths. These Noble Truths are the key to attain Nirvana, without proper understanding of Suffering, Cause of Suffering, Relief of Suffering and the way to end Suffering, These are the four Noble Truths."
Follow the 8 noble path which all buddas follows and show followers to follow.