Originally Posted by Flying Elvis

Turn radius for a 30 degree bank angle ~ mach minus 2 or 10% of Ground Speed. Roughly double that for 15 degrees. So, 3nm turn for 30 degrees at 300Kts (actual math formula is closer to 2.5, but you asked for ROT), 6 for 15 (again, closer to 5).

60:1 as described in earlier post tells us rough diameter of turn is 13.3NM, so turn radius is about 7 (6.7, but rounded up because you're making a 220 degree turn and I have 7 fingers I can count, but have a tough time counting 6.7).