How fast should a phone battery drain in an hour?

It's difficult to quantify how much percent drain per hour there is because it depends entirely on usage and settings/apps/etc.

•  I believe it is more accurate to assess standby time per hour - that is, utilisation that is low, if at all. If I am not using the phone, I drain roughly 1% every hour under normal circumstances.
• Experts advise against draining the battery to 20% or charging it to 100%. Instead, keep the charge between 30% and 80% to lengthen your life.
• Keep your phone charged to at least 40%. It is stated that the easiest strategy to enhance your smartphone battery is to maintain it at least 40% charged because it is extremely dangerous to let the battery go from fully charged to entirely discharged.

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