how many years should i do meditation to attain nirvana ?

Well, when I learned about Buddhism, Hinduism, and Jainism in class (not to say that you're practicing either of these religions),with Buddhism for sure, I don't think that it takes a set amount of time. You just reach it once you feel it. It took Buddha approximately 45 years to become enlightened.

meditation alone don't bring enlightenment.

the Buddha’s enlightenment is the direct result of this combination of meditation and wisdom - concentration and insight.

According to the Buddha, a sentient being who aspires to persevere on the path of Bodhisattva and accumulates unlimited pure merits for three Great Asogi Kalpa periods, may go to a pure land and attain Buddhahood.

My dictionary says:

1. (Hinduism and Buddhism) the beatitude that transcends the cycle of reincarnation; characterized by the extinction of desire and individual consciousness

2. Any place of complete bliss and delight and peace

How long is needed to achieve "nirvana"? About five minutes. All you need do is deal with the real world and stop looking for fairy-tale solutions.

42

One doesn't attain nirvana...but only realizes that nirvana is there all the time but his obscured thinking blocks his view of it.

you don't need years of meditation, just go to a music store. I'm sure you can find nirvana there.

None just accept Christ as your Lord and Savior and follow His teachings.