Fine for speeding: how long do they have to notify me?

Unfortunately you're not in the clear yet. The limit is 90 days from the date of the infraction to notify you of the fine, but the law allows them to extend this deadline in certain cases, so technically they could have more time. Three weeks have just passed, so you're still well within the window. The advice is to keep an eye on your documents over the next 2-3 months.

When you receive the notification (usually by registered mail), another procedure starts from there: you have 60 days to pay or appeal if you think you have valid reasons. If you ignore the registered mail or don't pick it up, the situation becomes more complicated. In your case, with the overtaking at 135 in a 110 zone, it's a pretty clear-cut violation, so the fine will probably arrive. It's best to be ready to pay it when it comes, especially since putting it off won't help.

The legal deadline is 90 days from the date of the infraction, but that doesn't mean everything expires after that period. If they've already started the proceedings during those 90 days - even just an internal communication between the Traffic Police and the competent office - technically they have more leeway. The actual notification still has to reach you, but the clock isn't as straightforward as it seems.

What matters most is whether they have your correct address on file. If you live peacefully for months and then suddenly it shows up at your door, that won't be a legal surprise. At that point, honestly, it's more a matter of luck than law. The speed camera on the A4 will have recorded everything, so sooner or later they could notify you. There's no "safe" deadline after which you're completely in the clear, even though the 90 days is the theoretical deadline that the law sets. Stay calm but not too calm.