well, each concert I'm hired to do will have about 2Gb of data (minimum) because I take pictures from the initial meet, rehearsals, sound check, final rehearsal with lighting cues etc, the concert and after-concert party (or sometimes, parties)... and with tonloads of crews wanted to have their picture taken with the likes of Mariah Carey, Dave Koz, Patti LaBelle, Gloria Estefan, sometimes 4Gb is not enough to cover a concert. I don't do a lot of concert. Maybe two a year, but when I say a concert, it's really an event, not just the concert for one or two songs.
I've done no more than a dozen of big concerts (and several mini ones) and they accupy about 50 Gb of data, plus my personal files since 1992 (about 30 Gb) and some weddings and product shots that I really like. All in all, they are about 100 Gb. 97.6 Gb to be exact.