On regualr use usually 160 hours or longer depending on the heater.
An average would be meaningless. Some last for years, some are up and down in days, even in hours.
an average of 4 hours
The length of time 13 shots would last in a person's blood stream will depend on their tolerance. This could be anywhere from between 8 and 12 hours on average.
That would depend on too many things that are no listed. Need to know what the desired temperature is.. What the BTU rating of the heater is, what the efficiency rating is, what the R value of the structure is.
The cheap $5 to $10 ones usually last about 40 to 60 hours on average. $40 Phillips last about 500 to 700 hours
If you draw one amp of power for 1 hour that is an amp hour . If you have a different load eg a heater drawing 3 amp , it would be 20 minutes . Divide the hour ( 60 mintues ) by the amps you draw .
15,000/305=49.1 hours.
The average Canon camera battery lasts for about 2 to 4 hours, depending on the model and usage.
I have been waiting for you for the last two hours would be correct.
The event is generally 3 days. The actual race - 3.5 to 4 hours.
The effects of cannabis last on average for a maximum of 3 hours.
I doubt even 1