I agree with the excellent responses to the OP. When it comes to writing, I think of conflict as the incentive(s) to move the story forward. It can be big -- an epic war, or small -- annoyance at a co-worker who always eats at their desk, and chews with their mouth open. Conflict can be antagonistic and brutal, however, conflict can also stem from love and caring (your beloved, very kind mother hopes you will wear her wedding gown for your nuptials, but you think the gown is hideous). The primary conflict of a story does not have to be the grandest event, the one that impacts the most people. A war is huge, but the primary conflict in a story can be a character's need to return home to visit a loved one, making the war a secondary conflict (impeding the character's return home).
And I don't think everyone has to use the two line - or the 13 line rule. I think readers have a little bit more patience than that, but not much. For me, personally, having to read a long, drawn out description at the beginning (unless very well done) is boring and makes me wonder...what is this book about? But then I'm not one of those patient readers.
I agree. As a reader, my patience depends upon the story's setting. With contemporary settings (regardless of genre) I need to be introduced to the main character immediately, and quickly given a reason to be interested in that character. I'm already familiar with the contemporary world, and I will not spend time reading descriptions of the mundane in the opening pages. My patience lasts for only one, maybe two (if very well written), pages. With settings in, or on, other worlds (for example, high fantasy or science fiction), introduce me to the main character, but also tell me about the world. In these instances, my patience lasts for around 1,500 to 2,000 words, maybe double that if the writing is exceedingly well done.