Maybe people think a 'true' friend ought to be available day or night, to do anything. Where did that idea come from? I am certainly not like that.
Excepting true emergency, I am not prepared to do any such thing, neither would I expect it.
I am a person who likes proper borders and etiquette. Make firm arrangements to meet. No lending or borrowing money, no calling up at midnight over some trivial matter. I have sometimes made a connection with someone, only to find they assume and presume a great deal. Then I finish it quickly.
An example was a very nice friendly neighbour, we had so much in common. I invited her over, enjoyed her company. Then she began knocking on the door virtually daily and staying hours. I had to hide! Until she got the message that I will not have my time wasted.
There ARE unwritten rules, all based on sensitivity, courtesy. My best longest friendships have lasted through obeying those borders and respecting each other's need to live our own lives, never intrude. Old fashioned inviting and being invited in turn.