Yeah basically you have a lot of candies saved and a lot of weak pokes saved that can evolve with less candies. Then fire your lucky egg and evolve everything for the full 30 minutes. You get 1k exp per evolution (even more if the evolved poke is not in your pokedex). I think using lucky egg for evolutions is better than pokestops and wild encounters since you get a lot more exp for evolving and you can do it from home and you can get like 60k in 30 minutes (assuming you have enough pokes and candies to evolve 60 pokemon)
I say 60 because it takes ~30 seconds per evolution. 30 min * 2 = 60 evolutions
I say 60 because it takes ~30 seconds per evolution. 30 min * 2 = 60 evolutions