2 files :
asic-freq-high with high clock.
asic-freq-low with low clock
# reduce frequency at noon (00:00 default shanghai time)
0 0 * * 1-5 cd /etc/config && cp asic-freq-low asic-freq && reboot
# increase frequency at 5pm (05:00 default shanghai time)
0 5 * * 1-5 cd /etc/config && cp asic-freq-high asic-freq && reboot
thank you

I just set this up on one of my miners to run noon->5pm at lower speed to see how it works out.
if all goes well this would pair nicely with a voltage mod to use the least power when TOU is $0.12/kwh and maximum speeds when it is only $0.07/kwh
Is there any easy way to modify files for this (the two asic-freq files and crontab) on all my miners simultaneously?