I only speak for myself here. But i advertise 1-5 business days for base map to be sent from time of purchase, and same for revisions once logs are returned. 1-5 business days doesn't include weekends, yet i still do stuff for people on weekends which is technically the only real time i have off from anything, lol. I do my best to to stick to that posted advertising on my website of 1-5 business days.
There are times when it can take longer, but i do try despite whats advertised to do same or next day when i can. But those are usually for people if they have a severe issue, which isn't common, then i slide a couple normal revision in between those and working my normal queue.
Me personally, i work from oldest to newest in terms of when the logs come in. and generally what happens is people either don't read the advertisement timeframe, and send me a new email daily or every other day and the there mail gets bumped to the bottom. There are times however where i miss emails due to the sheer amount or inquiries i receive
To put it in perspective, as the owner of the vehicle, think about all the questions you have or may have about your car, whethr its an issue, quirk, next mods you should, a funny sound you heard, what fuel is best, how much power you think you're making, what does this random code mean, can you look at this log, got my car tuned by someone else can you look at the log and see whats wrong, and the list goes on. Now multiply that time it takes to type and re-read all your questions and formulate a response by 100+ daily. Thats just emails. Thats not including text messages, phone calls, and 100s of social media messages, tags, and etc. And still doesn't include normal day to day inhouse on dyno tuning and r&d. And half of those inquiries may or may not even be paying customers. But if you ignore them, you become the asshole or a shit vendor
I average about 4-5 hours of sleep per night if im lucky. Nowadays, people want their tuner to be their mechanic, teach them how to email, diagnose a whistle from a video, walk them through everything under the sun, tune their car, and so on and so on. All for minimum ROI. 10 years ago i could charge $1000 for all that work and availability. but can't do that anymore due to all the pop up tuners charging $100 for a tune and people going to them for the price, not the knowledge. been doing this for like 20 years. So i've seen the swing to wanting a mountain for a penny as opposed to getting a mountain for a mountain.
In short, i love my customer base, and i do my absolute best to support them as fast or as much as i can, and i will continue to do so. But i don't think people really understand the amount of work some of us tuners have to do to continue supplying people with proper and great service despite waiting a few days. Then you have the dishonest people whole submit chargebacks after they get the products and service. Which makes doing this that much more frustrating at times.
But yea, 1-5 business days is what i advertise on all my tuning service product descriptions. but can sometimes take a bit longer.