What is the time for Maghrib prayer according to our current calculation, and does it extend until the time of 'Isha prayer as specified in the calendar?

The time for Maghrib prayer begins with the setting of the sun's disc and ends with the disappearance of the red twilight. With the end of the Maghrib prayer time, the time for the 'Isha' prayer begins. The reliable method for knowing prayer times is through the Shariah-prescribed signs.