For the first year I thought the answer was as much as humanly possible. We talked three or four hours a day and I was proud of it, right up until I started dreading the phone ringing.
The honest answer is that most long distance couples I know land somewhere around one real conversation a day plus light contact in between. But the number matters far less than whether both of you picked it.
Here is how we got from four hours a day to something that actually worked.
Talking More Is Not the Same as Feeling Closer
Our four hour phase looked healthy from the outside. Inside it, I was running out of things to say by minute forty and filling the rest with reassurance seeking.
I would ask if he was okay six different ways. He would say yes six different times and we would both get quietly frustrated.
The volume was covering an insecurity, not solving one. More minutes on the phone were never going to fix a fear I had not named yet.
When we cut down to about an hour, the hour got dramatically better. We had things saved up and neither of us was performing energy we did not have.
If your calls are long and hollow, adding time will not help. Something else is asking for attention.
That was hard for me to hear from myself. I had built my whole sense of the relationship on how many hours we logged.

Match the Schedule to Your Real Lives
My partner works early and I work late. For a year we forced a nightly call that was too late for him and too early for me, and we both showed up exhausted.
We finally admitted it was not working. Now we do a short morning voice note and one real call four nights a week, on nights that are actually good for us.
Fewer calls, better calls. Nobody is watching the clock waiting to fall asleep.
If you have a time difference, one of you is always sacrificing something. The fair version rotates that instead of the same person losing sleep every night.
Write it down for a week and look at it honestly. Most people are shocked by how much of their contact happens at the worst possible hour for one of them.
The light contact in between is what makes fewer calls survivable. I go through the small habits that carry us on the off nights in my post on daily check-in ideas for staying connected.

Separate the Quick Contact From the Real Conversation
We used to treat all contact as the same currency. A photo of his lunch counted the same as an hour on video, which meant some days we technically talked and still felt like strangers.
Now I think about it as two separate needs. Light contact keeps you in each other’s day, real conversation keeps you in each other’s life.
Light contact can be almost nothing. A photo, a voice note, a link to something stupid, a good morning at whatever hour morning happens for you.
Real conversation needs both of you awake and not multitasking. Twenty focused minutes beats two distracted hours and I would say that to anyone.
Once we named the difference, the pressure dropped. A quiet day with three texts stopped feeling like neglect because it was never supposed to be the real conversation.
If the real conversations keep going flat, the frequency is probably not the issue. That is usually about what you are talking about, which I covered in what to talk about when you run out of things to say.

Watch for the Difference Between Wanting To and Having To
There was a stretch where I answered every call out of obligation. I loved him and I still felt my stomach drop when his name came up on the screen.
That feeling is information, not betrayal. It usually means the schedule outgrew what either of you can actually give.
I was too scared to say it for two months. When I finally did, he admitted he had been feeling the exact same way and had not wanted to hurt me either.
We both apologized to each other for something neither of us had done wrong. Then we cut the schedule in half and everything got easier.
Asking for less contact is not the same as wanting less relationship. It is the difference between a habit that fits and one you are dragging behind you.
Say it early, while it is still tiredness and not resentment. The version of that conversation I had at month eight would have been much kinder than the one I had at month ten.

So What Is the Right Amount
The right amount is the amount you would both still choose on a bad week. If it only works when everything is calm, it is too much.
For us that is one real call four or five nights a week, plus small contact most days. For a friend of mine it is a two hour video call twice a week and almost nothing in between, and they are perfectly happy.
Neither of us is doing it wrong. The couples I have watched struggle are the ones where one person wanted daily and the other wanted weekly and nobody said so out loud.
Have the conversation on a good day, not after a fight. Ask what feels like enough and what feels like too much, and be ready to hear a different number than yours.
Then revisit it every few months, because it will change. Ours has been rewritten at least four times and it is better every time.
If the talking itself is where things break down, my guide to communicating better in a long distance relationship is the one I would read next.