60 watts to kWh per day and month

1.44 kWh/day

for 60 W running 24/7 · 43 kWh/month · $7.13/month at 16.5¢

60 W by hours of use

Use	Per day	Per month	Cost/month
1 h/day	0.06 kWh	1.8 kWh	$0.30
2 h/day	0.12 kWh	3.6 kWh	$0.59
4 h/day	0.24 kWh	7.2 kWh	$1.19
8 h/day	0.48 kWh	14.4 kWh	$2.38
12 h/day	0.72 kWh	21.6 kWh	$3.56
24 h/day	1.44 kWh	43.2 kWh	$7.13

kWh = W × hours ÷ 1000. Devices with thermostats or compressors cycle, so actual use is often lower than the rated wattage × hours.

1.44 kWh running 24 hours, 0.48 kWh at 8 hours.