When I listen to any song I like for the first time, I start to memorize the lyrics gradually. If it is a song I like and I play it daily it can take me two days. But if I just play it once in a while then it take me about a week.
It takes lots of time for me to memorize the lyrics of a song now a days. I remember in my childhood I used to memorize the songs while listening at once but not now a days, may be I am getting memory loss with the age.
I can't tell exact time but if the song is good I can memorize in few days. Nowadays some old songs also trending in youtube which I watch repeatedly and memorize.
I'm the type that doesn't learn the lyrics to most of the songs I listen to. I think the only songs I somewhat know the lyrics to are ones by the comedy band Flight of the Conchords. I listened to their music so much, that I know some of the lyrics to some of their songs. Now days I don't listen to them as much, so I probably forgot most of the lyrics anyways.
When I listen to music, sometimes the lyrics go over my head and I just focus on the sounds. Also I often am doing other things when I listen to music, so it's kind of background noise to what I am doing.
