Real means phone verified, checked for duplicates, screened on finance and sold to you alone. A shared list fails the first test before you dial. Fast means minutes, because a refinance enquirer is usually already comparing. Long means the person who said not yet in March gets a call in June.
The honest answer includes the failures. Some leads are wrong, and a supplier should say what happens then. Ours are reviewed within five business days and replaced or credited when confirmed invalid. Half of one group we measured failed on finance before any broker spoke to them, which is why the finance screen behind our qualified mortgage leads runs before delivery, not after.