This is a great question, and I am glad somebody asked it. But I think the real question is how many losses before we can say we are done?

I am at a loss now of 10k PHP ($180-200). (estimated only) But I have not stopped yet. I am still playing, although it's not continuous, so I guess that's why it takes so slow. Also, I am playing slots with just a 1 peso bet. The minimum of most slot games in the local online casino.
I think my point of no return is when I lost 20k in slots only, and it won't give me back a part of what I lost. I mean, I am expecting at least a bit of RTP, but if that doesn't happen until I feel like I am losing much, then I am gone.