Another round

Duration 31:00 TSS 25 IF 0.71
02:00 @ 50%
01:00 @ 50%
01:00 @ 55%
01:00 @ 60%
01:00 @ 65%
01:00 @ 70%
02:00 @ 55%
3x
00:45 @ 121%
05:00 @ 55%
00:45 @ 120%
04:00 @ 50%
Short, high-intensity efforts. How many rounds will you go?