It is 5 hours:
9pm EST is 2am BST the following day.
24 hours
12 hours.
5 hrs afrter 9am is 2pm; 5 hrs afrter 9pm is 2am
4to 9pm is how much hours
Between 10am and 9pm, there are 11 hours.
There are 17 hours between 9pm and 2pm the following day.
SIX hours !
7 hours.
7 hours.
7 hours
There are 4*(1 + 6*k) hours where k is an integer.