Time that feels endless:
* As long as a lifetime: This emphasizes the immensity of the time period.
* Like a never-ending story: Suggests a time that seems to drag on forever.
* As long as the stars have shone: A poetic comparison that highlights the vastness of time.
* Like a desert without an oasis: Evokes a sense of monotony and lack of progress.
* As long as the river flows to the sea: Conveys a constant, unrelenting passage of time.
Time that feels like a journey:
* Like a winding road through the mountains: Implies a time that is both long and filled with challenges.
* As long as a journey to the moon: Highlights the distance and effort involved in the passage of time.
* Like a ship sailing the ocean: Suggests a long, uncertain journey with unpredictable turns.
Time that feels like a physical object:
* As heavy as a thousand weights: Emphasizes the burden or weariness of a long time.
* Like a stretched elastic band ready to snap: Implies a tense and potentially fleeting time.
* As deep as the ocean: Suggests an immeasurable, vast amount of time.
Time that feels like a change:
* Like the slow thaw of a frozen lake: Conveys a gradual and significant change over time.
* As long as the seasons change: Highlights the natural cycle and flow of time.
* Like a caterpillar transforming into a butterfly: Suggests a profound metamorphosis over time.
The best simile for a long time will depend on the specific context and the feeling you want to convey.