Like Herb said there are no exact answers and how much reverb you use depends on the song and your preference. For instance a new age or ambient song may use lots of reverb while a rock or funk song only a little or no reverb. Thus each song is totally different when it comes to reverb.

I try to use the same reverb for a song with the lead guitar as a possible exception; some guitar amps have a spring reverb so I may put one on said guitar.

I very rarely put reverb on a bass line or bass drum as that can muddy up your mix.

I always put some reverb on horns and orchestra strings as it adds realism IMHO.

I also use MIDI for all of my songs but I never use MIDI reverb, CC91, actually I rarely use any MIDI CC effects.

So it would be helpful if you listed the DAW and reverb effects(s) you are using and maybe the genre of the song. Also you could post your finished song in the showcase forum and ask for recommendations.

I hope this helps and if I can be of further assistance fell free to contact me via a PM.

Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware