There is no "fixing" of training times.

You could however fix the constant propaganda of making "AfRaId GeRmAnS BlOcK SuPpLiEs AgAiN!" out of statements that they will not deliver something before Ukrainians are trained to operate it...

But as everybody seems to love the narratives so much we will always see those rediculous acts of playing Telephone:

• German media reports deliveries will happen after training is done

• US media picks it up and reports that Germany is not delivering as long as Germans would be need for operation (as bringing in soldiers from a NATO country is an escalation against NATO policy)

• Ukrainian media picks up the US report and cries about those stupid Germans not helping because they are always afraid of some imaginary escalation

Every single time, like clockwork.

It's most likely a strategic demand for finding a diplomatic solution in the middle at the end.

One side isn't really in favour of sending the cruise missiles and the other side strategically demands, what will most likely never be agreed upon. Then discussions, expert questioning, manufacturer feedback, analysis, more discussions... At the end everyone agrees somewhere in the middle. E.g. to send them, but the same way as France and the UK already did with reduced range and agreed countries to target.