It is duration of runs. He was just highlighting the absurde cost if you were to run it 24/7 like some people with their own self hosted runners do.
If its the price of runs, then its not always running.
If its price of the agent to exist, then thats not paying per runs- then you’re right that people tend to leave their runners online 24/7- but I’ve never worked anywhere that had workers building 24/7.
This is not uncommon in some orgs - less number of concurrent runners, slow builds, loads of jobs because of automation or how hooks for the runners are setup.
In the context of discussion that doesn't matter, OP's point distills to that they use minimum of 720 hours / month of orchestration time or some multiple of that on self hosted runners running 24x7.
Github will now charge $84 extra per month for single self-hosted runner running 24x7 - i.e. that is the cost for 43,200 build minutes for only their orchestration alone.
In a more typical setup that is equivalent to say 5 self-hosted running running ~4.5 hours a day(i.e 144/hours/runner/month)
For me, we do about 800,000 build minutes/month, for orchestration alone it is going to be $1600/month. In contrast the runner host we use (Namespace labs) cost $0.0015 / minute[1] which is less than orchestration cost for GH, that is just ridiculous.
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[1] It is even worse, the first 250,000 minutes is fixed at $250, so the base is $0.001 /minute for the runner.
Either way, we will likely pay 8-hours4-pipelines5-days=160 hours per week, just shy of 168-hours for true 24/7. This currently costs $0 just for context.