have a hard time

:  not easily penetrated :  not easily yielding to pressure

:  not capable of being spread :  very firm

:  having a harsh or acid taste

:  with great or utmost effort or energy :  strenuously

:  in a violent manner :  fiercely

:  to an immoderate degree

:  the measured or measurable period during which an action, process, or condition exists or continues :  duration

:  a nonspatial continuum that is measured in terms of events which succeed one another from past through present to future

:  leisure

:  to arrange or set the time of :  schedule

:  to regulate (a watch) to keep correct time

:  to set the tempo, speed, or duration of

:  of or relating to time

:  recording time

:  timed to ignite or explode at a specific moment