Silsilah as-Sahihah 628 — How long is prayer prohibited at sunrise

Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that the Noble Prophet (peace and blessings be upon him) said: "When the edge of the sun becomes visible, do not perform prayer until it has fully risen, and similarly, when the edge of the sun begins to set, do not perform prayer until it has completely set."