Thirty seconds!! How about three? When I do a vacation slideshow converted to digital, I started at 5 seconds using one second fades, then reduced it to four seconds because five was too long. People don't want to stare a picture for thirty seconds. Who does that?
Here's an Ektachrome slide show I did that lasts around 6 minutes and each slide is about 5 seconds, with music. Take a look and tell me if you actually got through the whole thing?
Depends on the setup. If it’s casual background to conversation, like music, it can work. But notice how I write “tops”.
Problem is if there is a mini lecture attached to each and every slide.
That get’s old real fast.
Unless you are doing an actual lecture, it should be a very short show.
Twenty pictures at the most.
Or alternatively with a whole carrousel, something that is just there, while you converse and eat and drink.
Of course you should also enjoy you own photography.
It should never be a chore to take out the projector. Otherwise you might as well not have it.