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Two days, no shower

In this example, you're traveling for 48 hours or more. In that case, there is a simple answer: You're going for quite a long time without showering. (It's, of course, possible to shower during the layover or even on the plane, but most people don't.)

Long time, no shower

In this example, you may be traveling for 35 hours or more. In that case, there is a simple answer: You're going for quite a long time without showering. (It's, of course, possible to shower during the layover or even on the plane, but most people don't.)

Normally, most people shower/wash themselves at least once a day. Many people do it twice a day. There are good reasons for that. Sweat, salts, etc. accumulate on the body, causing various uncomfortable sensations for oneself as well as others. Long air journeys can take much longer than that, sometimes causing you to not shower for > 50 hours. Perhaps, if you went that long without a shower unrelated to flying, you would notice some buildup of sweat too.

Normally, most people shower/wash themselves at least once a day. Some people do it twice a day. There are good reasons for that. Sweat, salts, etc. accumulate on the body, causing various uncomfortable sensations for oneself as well as others. Long air journeys can take much longer than that, sometimes causing you to not shower for > 50 hours. Perhaps, if you went that long without a shower unrelated to flying, you would notice some buildup of sweat too.

Normally, most people shower at least once a day. Many people shower twice a day. There are good reasons for that. Sweat, salts, etc. accumulate on the body, causing various uncomfortable sensations for oneself as well as others. Long air journeys can take much longer than that, sometimes causing you to not shower for > 50 hours. Perhaps, if you went that long without a shower unrelated to flying, you would notice some buildup of sweat too.

Normally, most people shower/wash themselves at least once a day. Many people do it twice a day. There are good reasons for that. Sweat, salts, etc. accumulate on the body, causing various uncomfortable sensations for oneself as well as others. Long air journeys can take much longer than that, sometimes causing you to not shower for > 50 hours. Perhaps, if you went that long without a shower unrelated to flying, you would notice some buildup of sweat too.