IIRC, nostr:npub1lh273a4wpkup00stw8dzqjvvrqrfdrv2v3v4t8pynuezlfe5vjnsnaa9nk did something fancy to measure this somehow. Or maybe it was Chow with bitnodes (https://bitnodes.io/nodes/all/)

Anyhow, I think the difference is like a low integer multiple of reachable nodes. So maybe 45-90k.