Pretty standard for normal phones... It goes to 99% around 30 mins. Here's a guideline from previous experience (used consistently, not left overnight because you loss around 1% every hour or so)
100% - 30 mins usage
97 % - 40 mins usage
93 % - 1 hr usage
75% - 2 hr 20 mins usage
60% - 3 hr 30 mins usage
50% - 4 hr usage
40% - 4 hr 30 mins usage
30% - 5 hr 15 mins usage
20% - 6 hr usage
10% - 6 hr 50 mins usage
5% - 7 hr 15 mins usage
1% - 7 hr 30 mins usage
That's my typical use anyway. No music.