A solar day on Mercury lasts about two Mercury years.
One sunrise-to-sunrise cycle takes about 176 Earth days. One orbit takes about 88.
Mercury races around the Sun in about 88 Earth days and turns on its axis about once every 59 Earth days. Its orbit and rotation together make the Sun move slowly across the sky.
A full cycle of daylight and darkness takes around 176 Earth days. From some spots, the Sun can briefly appear to rise, set, and rise again when Mercury is near its closest point to the Sun.