You can drag zoom into a specific time period using mouse right click+drag within the waveform area of Waves. For touchscreen devices, 2-finger pinch will zoom in and out.
You can use the Zoom+ / Zoom- toolbar shortcuts to zoom in and out. The Zoom Fit button will restore the zoom level back to fully zoomed out. The keyboard shortcuts for Zoom+ and Zoom- are 'i' and 'o' respectively. The keyboard shortcut for Zoom Fit is the 'f' key.
The expression to manually set the zoom level is =zoom(startTime, endTime). http://support.initialstate.com/knowledgebase/articles/506813-expressions-zoom-starttime-endtime
You can pan left and right through time when zoomed in by drawing the waveform with a left click+drag within the waveform area of Waves. For touchscreen devices, a 1-finger touch+drag will pan left and right. The left and right directional arrows on the keyboard also pan left and right.
Zooming and Panning Video Demo (0:30):