What type of information does an en route strip include regarding estimated time?

The correct information contained in an en route strip regarding estimated time is the estimated time over the previous fix. This detail is crucial for air traffic controllers as it provides insight into the aircraft's progress along its flight path. By knowing the estimated time over previous fixes, controllers can ascertain how long it will take for the aircraft to reach subsequent fixes and ensure the appropriate separation between aircraft.

In contrast, while estimated time of arrival is important, it is typically not included in the en route strip. Instead, it is more relevant to terminal operations. Estimated departure time does not apply since the en route strip focuses on the aircraft's position during the flight, rather than its departure. Estimated fuel consumption is also valuable information, but it does not fall under the category of estimated times relevant to the en route phase of flight.