The one who practices Samatha (Concentration) meditation with following 5 attributes, attains enlightenment in very short time.
1. Living with contentment, having fewer activities.
2. Having food only to maintain his body.
3. Sleeps very short time, that needed only to rest the body.
4. Listens, keeps in mind and contemplates the Dharma well.
5. Skilled in identifying and eradicating craving, hate and ignorance.