Caffeine is habit forming. If you're in the place where you "have to" have a cup of coffee every morning just to feel OK you can probably get over it after about two weeks of abstinence. Probably the hardest time is the second day.
Habit forming? This is obviously a physical dependence like any other drug. There are thousands of case reports on /r/decaf outlining a recovery period of months and years with horrible side effects like anhedonia, panic attacks, sleep issues, brain fog, cramping. The hardest day is day 2?? You honestly believe that is sufficient payback for the years of being buzzed up and artificially interested in boring and pointless office work by drinking this poison?
> a recovery period of months and years with horrible side effects like anhedonia, panic attacks, sleep issues, brain fog, cramping
These are all anecdotes - I don't believe there is actual evidence for this being the case. With such reports, it is frequently the case that there are other factors that influence this as well (for example, getting off of multiple drugs at once or an external factor that influences quitting, but that also makes you sad). I'm not saying it absolutely can't take a while to feel normal again, but you should take this frankly histrionic type of reporting with a grain of salt.
Given no other type of input, you should expect to be average. On average, it takes a week or two to get over coffee and you may miss it for a while.
Your statement about "years" of coffee drinking is irrelevant. The amount of time you are on a drug has little to do with the amount of time the body needs to achieve homeostasis when you stop taking it.
Not true at all. For every 1 year you can expect 1 month extra to recover fully. Every drug withdrawal group has some variation of this with different figures. An example a guy who watches porn for 2 weeks will have a much shorter reboot than one who watched porn for 24 years. That second guy will go through 2 years of PAWS and has destroyed his hormonal system. Moving away from stimulations to stimulants, Coffee stops blood flowing through specific areas of the brain and increases it flowing through other areas thats why your experience of life changes while on coffee., this is even worse, its a physical drug , but it has also destroyed other types of glands like the adrenals. You are very naive and foolisj to think you can pay back the years of being buzzed up and not experience a depression for a long long time afterwards. You have to repay it all. Its the same for most drugs, weed affects the blood flow through other areas of the brain and long term this can cause irreversable damage.
3 of the top 5 posts of all time on that subreddit as an example are speaking in terms of "915 days caffiene free", "2.5 years caffee free" .. etc. These are the most dramatic and interesting stories shared there but the people there are obviously interested in long term case studies and these stories are popular for a reason. Nobody cares about "2 weeks" there everyone quickly realises this is a long slog to getting back to normal of months and years.