Does love sustains without physical intercourse for long?

No it can't be sustain unless they be together before and something came up and separate them but they we still come back later like education or going for training which can make two lover be separated

Depends on the people, depends on the relationship, depends on the culture/social support for the relationship and "love," depends on the purpose/goals the relationship is facilitating, depends on the type of "love" you are referring to.

It can.
But if it doesn't, it's not "bad."
Unless you want to judge it as such because your expectations aren't met.

Of course it can. Thousands of people, millions probably do it.

A relationship build on real love can withstand anything. Think about soldiers on deployment for months or years at a time or couples where due to illness or physical problems. The live doesn’t disappear.

There are a lot of reasons why sex isn’t part of the equation. Look at Chris Reeves who played Superman. After a fall from a horse he was disabled from the neck down. His wife didn’t leave. She stayed with until his death years later.

If it is real love and the couple are committed they will find ways to make it work.

New love can be the same. Believe it or not there was a time sex before marriage was not accepted. People dated and sex didn’t happpen until the wedding night. And many of those couples stayed together for the rest of their lives.

One of the main trouble for many relationships is where one person is coercing the other to have sex as some “proof” of love. Coersion has nothing to do with love.