Short Cut: Selection Toolbar

I have 50+ old Mp3 of 200MB (1.5hrs) each to do: For each, I need to, by listening to the track, to select a segment beginning at around 15+ minutes from the start; then for a length of 45-60 minutes, for further processing.

The segment is mostly a church sermon between worship music/Choral etc.

After the tedious labor of selecting the Start and/or End points, how do I get those points automatically inputted into the Selection toolbar respectively, ready for the next step of conversion etc?

I currently would manually inputting these hh:mm:ss.

If you are able to use a mouse, zoom to a suitable level so that you can see the section of waveform that you want to work with (http://manual.audacityteam.org/man/zooming.html), and then click and drag on the waveform with your mouse to make the selection.
The shortcut “Ctrl+F” zooms to fit the entire project in the Audacity window.