My Trekking Difficulty Scale

I categorize the difficulty of trekking into 5 levels.
And I label every trip with them.
The levels are...

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1

Cars accessible to the peak/plateau 

2-3 hours trekking time on the peak/plateau

Level ground or not many slopes

No need to stay over night

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2

Cars accessible to the peak/plateau

Half a day trekking time on the peak/plateau

More slopes than level ground

No need to stay over night

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3

Cars only accessible to the trekking point

A whole day trekking time to the peak and on the plateau

Many slopes, rare level ground

No need to stay over night

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4

Cars only accessible to the trekking point

Around or more than 5 kms to trek to the peak/plateau

Many slopes, rare level ground or huge plateau to explore

Requires 1 night to stay

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5

Cars only accessible to the trekking point

Around or more than 10 kms to trek to the peak/plateau

Many slopes, rare level ground or huge plateau to explore

Requires more than 1 night to stay