Bus Compressor Release Time Is Inaccurate?

I’m sure I remember at some point the maximum release time on the Bus Compressor was 5000ms, but now it only goes up to 2000ms, even though the actual maximum release time (as determined by counting) still does seem to be about 5 seconds. Trying out different values suggest that there is some scale factor in use, for example setting 1000ms results in a release of about 2 seconds.