The adequacy of padding for extended sitting on a leather reclining sofa can vary depending on the specific model and your personal preferences. Here are some factors to consider when evaluating whether the sofa's padding is suitable for extended sitting:

Cushion Thickness: Check the thickness and density of the seat cushions. Thicker and more dense cushions often provide better support and comfort during extended sitting.

Firmness: Consider whether the cushions are too firm or too soft for your liking. A balance between firmness and softness can prevent discomfort during prolonged use.

Material Quality: High-quality foam and cushion materials tend to retain their shape and support over time. Lower-quality materials might compress and lose their comfort relatively quickly.

Seat Depth: The seat depth should be appropriate for your leg length. Too much or too little seat depth can cause discomfort during extended sitting.

Lumbar Support: Adequate lumbar support is crucial for comfort during extended sitting. Look for a sofa that provides proper support to your lower back, maintaining the natural curve of your spine.

Recline Adjustment: If the sofa has adjustable recline angles, you can experiment to find the reclined position that offers the most comfort for extended sitting.

Testing: Spend some time sitting on the sofa in the showroom or wherever you're evaluating it. Pay attention to how your body feels after sitting for a while. If you're shopping online, read customer reviews to get insights into comfort during extended use.

Personal Preference: Comfort is subjective, so what might be comfortable for one person might not be the same for another. Take into account your own comfort preferences and any potential health considerations.

Longevity: Consider how the padding is likely to hold up over time. High-quality padding materials tend to maintain their comfort and support even with prolonged use.

Additional Features: Some reclining sofas come with features like adjustable headrests, lumbar support, and even massage functions, which can enhance comfort during extended sitting.

Remember that what's comfortable for short periods might not necessarily be comfortable for extended sitting. If you're planning to spend a significant amount of time sitting on the sofa, it's worth investing in one that offers the right balance of support, cushioning, and comfort for your needs.