Usually, the time report begins with the decision on the supply of tanks. Then 2 to 6 months of crew training is required. Six months in war conditions is a lot, so it will be two months.
Then a month to assemble the unit and a week to deliver tanks to the front line

However, the system has been changing recently.
Tankers are beginning to be retrained on the new Challengers and Abrams at the stage of negotiations on the supply of weapons.
This is how it was and is and will be with the delivery of Patriot air defense systems, with the delivery of German Cheetahs and with future deliveries of American F-16s or British Typhoon Eurofighters.
In this way, new western tanks will come to the front in Ukraine in a week or two, and we will talk about their combat use we will hear in a maximum of a month or even earlier.
Thus, the shock tank fist of Ukraine may appear at the front in late February-early March.
Most likely — in early March.
Since after the formal decision of the ninth Ramstein in mid-February on the supply of aircraft to Ukraine, they can start hostilities already in February.
After that, Ukraine will launch a counteroffensive with armored groups under the cover of the latest Western aircraft.
Already trained Ukrainian pilots will sit behind the helms of the new planes.
In principle, the West, like the rest of the world, has long been fed up with the Russian-Ukrainian war.
And if the war cannot end with peace and peace negotiations, then it must end with the victory of Ukraine in the interests of the Ukrainian and Russian people
The main concern of the West that the extremely strengthened APU could potentially go beyond the territory of Ukraine has already been eliminated by the Ramstein decisions on controlled arms supplies.
These supplies can be limited at any time if the military-political leadership of Ukraine decides to forcefully create a security zone at the expense of the Russian border territory.
In this way, the West solves its contradictions and goals. When Ukraine should weaken Russia as much as possible and restore its territorial integrity.
At the same time, they will try to prevent the collapse of the Russian Federation with an uncontrollable outcome.
The international activity of such formations in its composition as Tatarstan, Chechnya, or Dagestan can serve as a marker for a scenario with a controlled collapse of Russia
Moreover, this activity can be traced not only to the collective West, but also to such major players in the Muslim world as Saudi Arabia or Turkey
The address of the leader of Belarus about the Chinese guarantees or the statement of the same Lukashenko about the negotiations on the conclusion of a non-aggression pact with Ukraine can serve as indirect evidence of the ongoing negotiations.
Lukashenko realized a long time ago that in strategic terms, Russia has already lost, and that is why he is looking for options to get as far away from the Russian-Ukrainian war as possible.
At the same moment, it will be extremely important for Ukraine to protect itself from Belarus in order to free up the army for other missions.
It is expected that in the near future the parties will come to a compromise that will be reached by the time of the creation of the strike groups of the Armed Forces in the south and east.
It is expected that Ukraine will be able to, or has already been able to, agree with Poland on its insurance of Belarus’ implementation of such a separatist peace.
In case of violation of tripartite agreements between Ukraine, Belarus, and the Republic of Belarus, the latter may send troops to Ukraine and possibly to the border regions of Belarus.