The Peperomia Marble is a fairly small plant that grows to between 8 to 14 inches tall. In most cases it will be between 9 to 12 inches. As it gets bushier (which is when it looks best), its leaves will spread outwards to reach as wide as 10 inches wide.
Peperomia Marble enjoys bright, indirect light. Although, you want to limit direct sunlight to about 2 or 3 hours a day. And, if possible from the morning sun and not the intense afternoon rays.
Too much direct sunlight or intense exposure will burn its lovely leaves which are its crowning glory.
As a general rule of thumb, variegated plants need more bright light compared to those that are solid green in color.