Doing volunteer editing is time consuming. A story might be anywhere from 15 Microsoft Word pages to 750 Microsoft Word pages. An editor might receive two or three stories on the same day, all different lengths. Some of the stories might require a lot of work while others are eay to edit. An author might have Asperger's or be dyslexic so the story requires more effort to make it a readable story.
Sometimes I come across a story that it's obvious it was not edited. Words are misspelled, there are name inconsistencies, and there are repeated words, not to mention run-on sentences and poor punctuation.
I recommend each writer should have next to their computer an old- fashioned dictionary to look up words they used but are not sure about the spelling. The writer should be aware that Spellcheck only tells the writer if a word is spelled correctly, not if it's the word the writer intended to use. The writer should print out their story then read through it slowly in hopes of catching any errors they have made.