Can you imagine the immense good kamma that a ‘flux of becoming’ (a being) must have to be born when they will meet, hear, and understand the Teachings given by a SammasamBuddha?
These beings had put in the hard yards previously, and only needed a little assistance to reach Nibbana.
Some were only seven years of age.Who was the youngest arahant?viewtopic.php?f=13&t=6814&view=unread
Then there were others, like Ven. Ananda, who, though daily in the presence of the Blessed One, took years and years and years due to being busy with other duties. Seems to depend also upon the time you are able to devote to practice, how you keep your sila etc.