For ratio, I'm talking about a generic Insane difficulty here. I often get distracted by other things (or loss of motivation) so I usually take about 4-7 days for this.
For 1 minute of a song, I need more or less 20 to 30 minutes. That is assuming the music is also generic and not something like Camellia, which would take me 60 minutes.
What exactly normal is would differ depending on who you ask, my guess is that most mappers need 1.5 to 3 hours. This of course also varies with experience.
While speedmapping, i usually need 1-3 hours to map 1 minute of the song, depending on the difficulty, gimmick and technicality of the beatmap. But outside of that, i need a whole day to map 1-2 minutes of the song.