About 6 pages double-spaced or 3 pages single-spaced, using 12-point Times New Roman with 1-inch margins (roughly 250 and 500 words per page). Headings, block quotes, many short paragraphs and a reference list all add pages.
About ~6 min to read silently at an average adult pace of 238 words per minute, and about ~12 min to read aloud at 130 words per minute.
Usually an introduction, 6–10 body paragraphs and a conclusion, if body paragraphs run between 120 and 200 words. There is no fixed rule — follow the logic of your argument rather than a paragraph count.
It depends on your brief. Many institutions allow a margin such as 10% (for 1,500 words that would be 1,350–1,650), while others treat 1,500 as a strict maximum and some stop marking at the limit. If the brief does not say, ask your teacher or lecturer.
Usually the reference list or bibliography does not count, but in-text citations often do. Footnotes, tables, appendices and headings vary by institution, so check your assignment brief.