WITH recursive
  primera_Hora AS --Inicio 1er. CTE
  ( SELECT EXTRACT(HOUR FROM CURRENT_TIME) AS hora_1,
           EXTRACT(MINUTE FROM CURRENT_TIME) AS minuto_1
    FROM rdb$database r
  ), --fin 1er. CTE
  segunda_Hora AS --Inicio 2do. CTE
  ( SELECT EXTRACT(HOUR FROM CURRENT_TIME) AS hora_2,
           EXTRACT(MINUTE FROM CURRENT_TIME) AS minuto_2
    FROM rdb$database r
  ) -- Fin 2do. CTE
  SELECT --Arranca el baile chera'a
    CURRENT_TIME AS hora_minuto_actual,
    CURRENT_TIMESTAMP AS fecha_hora_minuto_actual,
    SUM(PH.HORA_1 + SH.HORA_2) AS TOTAL_HORAS_BASE, --Total de Horas, a secas
    SUM(PH.MINUTO_1 + SH.MINUTO_2) AS TOTAL_MINUTOS_BASE, --Total Minutos, a secas, sin considerar tope de 60
    SUM(PH.HORA_1 + SH.HORA_2) + CAST( (SUM(PH.MINUTO_1 + SH.MINUTO_2) / 60) AS INTEGER) AS Horas_Calculadas_con_Saldos_Minutos, --Horas Calculas ... ya con los minutos.
    CASE --mis minutos finales, dependeran, de si la sumatorio de minutos, paso o no los 59 minutos
      WHEN SUM(PH.MINUTO_1 + SH.MINUTO_2) <= 59 THEN CAST(SUM(PH.MINUTO_1 + SH.MINUTO_2) AS DOUBLE PRECISION)
      ELSE
        SUM(PH.MINUTO_1 + SH.MINUTO_2) - 60
    END minutos_Finales_Calculados_Con_El_Acarreo_A_Horas
  FROM primera_hora ph,
       segunda_hora sh