The Documentation (https://antigravity.google/docs/plans) claims that "Our modeling suggests that a very small fraction of power users will ever hit the per-five-hour rate limit, so our hope is that this is something that you won't have to worry about, and you feel unrestrained in your usage of Antigravity."
See https://irenezhang.net/papers/demikernel-sosp21.pdf for a more thorough paper on the Demikernel from 2021. There are some great ideas for improving the kernel interface while still allowing efficient DPDK-style pipelines.
The Documentation (https://antigravity.google/docs/plans) claims that "Our modeling suggests that a very small fraction of power users will ever hit the per-five-hour rate limit, so our hope is that this is something that you won't have to worry about, and you feel unrestrained in your usage of Antigravity."