How do you spend your time during a long- haul flight? How do you spend your time during a long haul flight?

If the plane I'm on has an entertainment system, I usually play games or watch movies on it. If the plane I'm on has an entertainment system, I usually play games or watch movies on it.

IfWhen I'm on the plane, I'm on hasve an entertainment system,. I usually play games or watch movies on it. When I'm on the plane, I have an entertainment system. I usually play games or watch movies on it.

However, the size of screen is generally small, so I can't see it for long time because of tired eyes. However, the size of screen is generally small, so I can't see it for long time because of tired eyes.

んーーー なんか違うけど、どう直せばいいのか分からない。

However, the size of screen is generusually small, so I can't see it for a long time because ofdue to my tired eyes. However, the screen is usually small, so I can't see it for a long time due to my tired eyes.

However, the size of screen is generally small, so I can't usee it for long time because of tired eyes. However, the size of screen is generally small, so I can't use it for long time because of tired eyes.

When talking about something a physical item / real thing, you wouldn't say you "can't see" something unless you physically cannot see it. For example, "I can't see the screen because it is blocked by a person" or "I can't see because I am blind".

However, the size of screen is generally small, so I can't usee it for too long time because ofit tireds my eyes. However, the size of screen is generally small, so I can't use it for too long because it tires my eyes.

However, the size of the screen is generally small, so I can't seewatch it for a long time because ofmy eyes get tired eyes. However, the size of the screen is generally small, so I can't watch it for a long time because my eyes get tired.

"see" is passive. It's more like 見える . "watch" is active, and better to use in this situation.

I think sleeping might be the best way to spend too muchkill the time. I think sleeping might be the best way to kill the time.

つぶすと言いたいですよね

I think sleeping might be the best way to spend too much timon an airplane. I think sleeping might be the best way to spend on an airplane.

I think sleeping might be the best way to spend too muchmost of my time. I think sleeping might be the best way to spend most of my time.

"Too much" is normally a negative thing. You would use it to say something is negatively too much most of the time. For example: "There is too much rain", "Don't add too much sugar", "I can't do too much to help". There are some exceptions but you wouldn't use it in the way you have typically.

I think sleeping might be the best way to spend too muchmost of my time. I think sleeping might be the best way to spend most of my time.

I think sleeping might be the best way to spend time when I have too much time. I think sleeping might be the best way to spend time when I have too much.

Just more natural phrasing.