We offer services all around Thailand, but the process is longer if not in Bangkok.
For yearly extensions it can be 3-5 days, and for non-immigration it can be 3-5 weeks depending on the visa. These turnaround timeframes do not impact your visa expiration date as the visa would be under consideration, and you cannot be under overstay while this is happening.
But for our Bangkok Express service it is all done same-day.