According to Best Piano tips you need to spend at least 40 minutes every day for 6 months to
- Have solid piano technique.
- Be able to play piano by ear.
- Be able to play piano songs where people would say, “Wow, you’re really good at piano”. https://www.bestpianotips.com/how-long-to-learn-piano/
This means that learning piano basics takes at least 120 hours which means that if you practice 1 hour every day you need at least 4 months.