Gaining Clock True Time

Clock gains $12$ minutes in $24$ hours $\implies 0.5$ min per hour. From 11 am today to 5 pm next day is 30 indicated hours. Indicated time of $60.5$ minutes = $60$ minutes of true time. Indicated $30$ hours = $30 \times \frac{60}{60.5} = 29.752$ true hours = $29$ hours $45$ minutes. 11:00 am + 29 hours 45 minutes = 4:45 pm (45 minutes past 4 pm).