Or were all the old second counting systems wrong?
Many people have pointed out that if you start a timer on your phone and count out to 45 Mississippis, hippopotamus or number-one thousands it now ties out to a minute.
I have tried it a dozen times myself and after 45 counts I get anywhere between 54 to a minute and 4 seconds.
I specifically remember counting chunks of time as long as 15 minutes and not being off by a minute.
The counting systems were always bullshit. Different people and at different times have wildly different speech tempo. What you can do is trying to find your rhythm by actually saying a word repeatedly as fast as you can without mispronouncing and counting how often you can do that in a minute; That’ll give you a fairly accurate measure you can use.