I think such measurements are possible technically, but I don't have time for that. There is a dump of all nostr events a couple months old, if someone wants to make such research: https://dtan.xyz/e/nevent1qqspf7tn2cgadduepdr8q08z6x7cnsqfu78cwg23wz43d9kajpz6xxqpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtczyp3lucccm3v9s087z6qslpkap8schltk427zfgqgrn3g2menq5zw6qcyqqqq05cw34txu