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