OK. Stedon = diazepam = Valium. Agreed.
Please check what you told us. It may help to use Google Translate
If you really meant to type 100-140 mg PER DAY, that sounds a lot. I hope a doctor prescribed it to you, and I'm a bit worried for you even then. It would be a big dose if
10mg Stedon is the same as 10mg Diazepam.
Normal Dosage Info from a patient information leaflet found online, others are similar:
Recommended dosage for Diazepam ADULTS
Treatment of Anxiety Disorders and Short-Term Relief of the Symptoms of Anxiety
The usual dose, depending upon severity of symptoms, is 2 milligrams to 10 milligrams 2 to 4 times daily.
So that would be between 4mg and 40mg total per day. The highest I have seen in a leaflet is 60mg per day in 10mg doses.
Even on low doses it is normal to reduce the dose slowly, by a few mg every few days or even slower.
If you only took them for ONLY a month - that is good, you could have shorter withdrawal.
That very high doage - that is bad, you could have longer withdrawal.
So it is very hard to estimate.
Good Luck with this.