Clock and horn question

[DTQ_Blue]

A situation I experienced as a TK in a frantic sequence at the end of regulation time prompted this question. As a TK, knowing what a clock-horn will do in this situation is significant to me. In a very, very noisy gym, a very short horn blast, e.g., two tenths, may not be well heard. A full blast is more likely to be heard, even over the noise. I guess I can just test each clock beforehand to know what I've got.