Choose the service that's appropriate for your needs, or combine them:
Basic Copy Editing: Spelling and grammar
Substantive Editing: Structure, cohesiveness, consistency, formatting and flow
ESL Editing: Making your writing sound more native/natural by highlighting the strengths of your own unique
style
OR a combination of the above.
Turnaround time varies depending on the level(s) of editing you need and the length of your specific project.