A long long time ago in a country far far away...... The wise man decided we should use 2 seconds.
Never changed and 2s is a nice time period.
With cheap watches and software programs you have 2 GPS points averaged in a track, with the GW60 and Gyro you have between 5 and 18 averaged. GW60 shows 0,2s on display, this should be on par with 1s.
I myself never look at 1s unless someone with a GT-31 or GW60 asks for my numbers, 2s is fixed on my Gyro display.