readme: add more training details

README.md

@@ -99,7 +99,7 @@ print(generated_text)
 Notice: this model integration is heavily under development. And in the process of finding good hyper-parameters.
 Also downstream experiments are coming very soon.
 
-Unfortunately, there are nan's occuring in the training:
+Unfortunately, there are nan's occuring in the training (after 7h 33m 14s of training on a single RTX 4090):
 
 ![Training Loss](training-loss.png)