The ideal viewing distance for a 43 inch TV depends on various factors, such as the resolution of the TV and the personal preference of the viewer.
However, as a general rule of thumb, a comfortable viewing distance for a 43 inch TV with a Full HD (1080p) resolution would be around 5-8 feet (1.5-2.5 meters). If the TV has a higher resolution like 4K or 8K, the ideal viewing distance can be a bit closer.
It's worth noting that personal preference can play a big role in determining the ideal viewing distance. Some people might prefer to sit closer to the TV, while others might prefer to sit farther away. So, ultimately, it's up to the viewer to determine what feels comfortable for them.