Want a normal answer? I cant lived comfy with simply 1 btc. Yes this is my honest opinion cause its value on our local currency can be spend within less than a year considering the inflation that could happened. Its big but considering all factors on the expenses for me its not enough especially the way on how I live and spend.

If you are talking about a fair holdings of btc then I could say 5btc to 10 btc would do. Anyway thats my estimation only.