Losses ~ 5 times revenues, negative gross profits style results continue.

How long can they continue doing this and still manage to raise the funds needed to keep operating?

Seems like madness to me, but they are still operating.

Share price reached 55 in 2021 now 2.63 so perhaps there is some recognition that things are not going well.

When investors will decide to cut their losses and stop investing more?

I am not sure I want to guess given how long this has been going on for.