RunPod also charges per second [1], also this is Google's expected avg cost per hour after running it 24/7 for an entire month, I couldn't find an hourly cost for each GPU.

When you need under <1hr than you can go with Runpod's Spot pricing which is ~4-7x cheaper than Google, where even 20min of Google would cost more than 1hr on RunPod.

[1] https://docs.runpod.io/serverless/pricing