Quite little now. Not very long ago it was 500g per every 2 weeks, maybe more as 500g is more like a start of a single meal but I did my best to eat as little liver as I could…
But right now it’s barely any. I have phases and I am not so much into organs right now. I ate so, so much organs in the last half year, I had my liver, I bought very much pâté, one had lots of other organs in it, I had tongue… But I will fry some pork liver soon as I can’t just avoid liver when I have 2 kg in my tiny freezer… And I have problems with chicken liver at the moment, not pork liver.
It is safe to consume it for every meal too if you keep it low. It’s not about frequency, obviously but amounts… When I dislike liver (the kind I have at hand, at least. I never got bored of all kinds of liver), I can eat it any time, today I consumed 40g. When I inhale 400g in a few minutes and want more the next day, that is a different situation 
Once I have read/calculated from data I have found online that 500g liver has Vitamin A for 2 weeks. So I try not to go waaaaaay over it. I eat plenty of Vitamin A from my other items (like the pâté I don’t count :D) so I am over above recommendations but who knows what my diet changes and anyway, there is a safe range somewhere and it can’t be tiny.
And today I watched a video though it was Vitamin D and it seems even massively overdoing it is fine for most people but if one has some kind of mutation (not even one type is possible) it becomes a problem. Maybe Vitamin A is similar, my body can handle it to a huge extent? Of course, better safe than sorry so if it’s easy not to overdo liver epically (it is), I won’t overdo it. If I would be utterly miserable without eating a lot of liver as often as possible, I would research or experiment more but I am quite glad I don’t need to do it.
Honestly I wouldn’t worry in your case yet, you probably will have enough of it soon if you consume a lot of liver.