diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index 45f5ce96a..ba57511de 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -2312,7 +2312,7 @@ messageExtendedMediaUnsupported caption:formattedText = MessageExtendedMedia;
 //@description Describes parameters of a Telegram Premium giveaway
 //@boosted_chat_id Identifier of the channel chat, which will be automatically boosted by the winners of the giveaway for duration of the Premium subscription
 //@additional_chat_ids Identifiers of other channel chats that must be subscribed by the users to be eligible for the giveaway. There can be up to getOption("giveaway_additional_chat_count_max") additional chats
-//@winners_selection_date Point in time (Unix timestamp) when the giveaway is expected to be performed; must be from 1 minute to 7 days in the future in scheduled giveaways
+//@winners_selection_date Point in time (Unix timestamp) when the giveaway is expected to be performed; must be 60-getOption("giveaway_duration_max") seconds in the future in scheduled giveaways
 //@only_new_subscribers True, if only new subscribers of the chats will be eligible for the giveaway
 //@country_codes The list of two-letter ISO 3166-1 alpha-2 codes of countries, only users from which will be eligible for the giveaway. If empty, then all users can participate in the giveaway. There can be up to getOption("giveaway_country_count_max") chosen countries
 premiumGiveawayParameters boosted_chat_id:int53 additional_chat_ids:vector<int53> winners_selection_date:int32 only_new_subscribers:Bool country_codes:vector<string> = PremiumGiveawayParameters;
diff --git a/td/telegram/ConfigManager.cpp b/td/telegram/ConfigManager.cpp
index 147eb471e..6cf4a0f12 100644
--- a/td/telegram/ConfigManager.cpp
+++ b/td/telegram/ConfigManager.cpp
@@ -1931,6 +1931,10 @@ void ConfigManager::process_app_config(tl_object_ptr<telegram_api::JSONValue> &c
                                 get_json_value_int(std::move(key_value->value_), key));
         continue;
       }
+      if (key == "giveaway_period_max") {
+        G()->set_option_integer("giveaway_duration_max", get_json_value_int(std::move(key_value->value_), key));
+        continue;
+      }
       if (key == "channel_color_level_min") {
         G()->set_option_integer("channel_custom_accent_color_boost_level_min",
                                 get_json_value_int(std::move(key_value->value_), key));
diff --git a/td/telegram/ConfigManager.h b/td/telegram/ConfigManager.h
index d0750da50..6dedb1a4e 100644
--- a/td/telegram/ConfigManager.h
+++ b/td/telegram/ConfigManager.h
@@ -102,7 +102,7 @@ class ConfigManager final : public NetQueryCallback {
 
  private:
   struct AppConfig {
-    static constexpr int32 CURRENT_VERSION = 18;
+    static constexpr int32 CURRENT_VERSION = 19;
     int32 version_ = 0;
     int32 hash_ = 0;
     telegram_api::object_ptr<telegram_api::JSONValue> config_;
diff --git a/td/telegram/OptionManager.cpp b/td/telegram/OptionManager.cpp
index 32e851dca..43b04a3ee 100644
--- a/td/telegram/OptionManager.cpp
+++ b/td/telegram/OptionManager.cpp
@@ -137,6 +137,9 @@ OptionManager::OptionManager(Td *td)
   if (!have_option("giveaway_boost_count_per_premium")) {
     set_option_integer("giveaway_boost_count_per_premium", 4);
   }
+  if (!have_option("giveaway_duration_max")) {
+    set_option_integer("giveaway_duration_max", 7 * 86400);
+  }
   if (!have_option("channel_custom_accent_color_boost_level_min")) {
     set_option_integer("channel_custom_accent_color_boost_level_min", 1);
   }