Philodendron giganteums come by their name honestly; when mature their leaves can grow over 3-5' long! Usually as a houseplant they grow a bit slower than that. Our current 14" pot size has leaves that are approximately 24" long.
Bright, indirect light. Water when top 2" of soil is dry, approx every 8-10 days. Prefers distilled water. Prefers higher humidity. Tropical soil with added perlite.