Unexplicable front end instances cost

My simple python website hosted on AppEngine got some increase in traffic. From total of 447 visitors and 860 views in September (peak 33 visitors on a day) went to 1K visitors and 1.5K views in October (peak 61 visitors on a day).

Meanwhile cost went from $0.00 in September to $10.66 USD in October. Cost breakdown shows that the complete amount is attributed to front end instances, totaling 930.15 hours of usage. That is about 30 hours a day.

Beforehand I have set my max_instances and max_idle_instances to 1. With a single instance running, how is possible to have 30 hours of usage in a day that lasts 24 hours?

I am using F4 instance class - once a month I parse an excel sheet (that doesn't depend on the number of visits), and more limited instance classes were timing out. As well, my front end is optimized and it fits in less than 30Kb. So with only 1.5K views a month, how can I have that much front end instance hours?

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