--- a/plugins/mod_register_limits.lua	Sun Jul 16 21:04:42 2023 +0200
+++ b/plugins/mod_register_limits.lua	Sun Jul 16 20:49:33 2023 +0200
@@ -16,13 +16,13 @@
 local errors = require "prosody.util.error";
 
 -- COMPAT drop old option names
-local min_seconds_between_registrations = module:get_option_number("min_seconds_between_registrations");
+local min_seconds_between_registrations = module:get_option_period("min_seconds_between_registrations");
 local allowlist_only = module:get_option_boolean("allowlist_registration_only", module:get_option_boolean("whitelist_registration_only"));
 local allowlisted_ips = module:get_option_set("registration_allowlist", module:get_option("registration_whitelist", { "127.0.0.1", "::1" }))._items;
 local blocklisted_ips = module:get_option_set("registration_blocklist", module:get_option_set("registration_blacklist", {}))._items;
 
 local throttle_max = module:get_option_number("registration_throttle_max", min_seconds_between_registrations and 1);
-local throttle_period = module:get_option_number("registration_throttle_period", min_seconds_between_registrations);
+local throttle_period = module:get_option_period("registration_throttle_period", min_seconds_between_registrations);
 local throttle_cache_size = module:get_option_number("registration_throttle_cache_size", 100);
 local blocklist_overflow = module:get_option_boolean("blocklist_on_registration_throttle_overload",
 	module:get_option_boolean("blacklist_on_registration_throttle_overload", false));