4 hours. "Red Candles in Frosty Sky" is a large-scale campus Huangmei opera musical that integrates red culture and teacher education themes. Frost Sky Red Candle performs for 4 hours, 1 hour is 60 minutes, and 4 decimals are composed of 240 minutes. The play "Red Candles in the Frost Sky" is a companion piece to the play "The Legend of Dabie Mountains".