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Here is a basic classifcation of schedules by their difficulty level, assuming a typical sleeper with 8h monophasic sleep and normal levels of SWS and REM:
{| class="wikitable"
|+
!Difficulty
!Example schedules
!TST range
!Sleep time cut
!Note
|-
|Easy
|BiphasicX, E1-ext,
Siesta-ext, Segmented-ext
|7-8
|<1 hour
|Recommended for beginners or those needing significant flexibility.
|-
|Moderate
|E1, E2, E3-ext, Siesta, DC1, Triphasic-ext,
Segmented, DC1-ext
|5-6
|1-2 hours
|Require a significant adaptation process, but can be quite flexible after adapting.
|-
|Hard
|E3, DC2
|4-5
|2-3 hours
|Require harsh adaptations and are not particularly flexible for most people.
|-
|Very hard
|DC3, Bimaxion, Triphasic
|4-5
|2-3 hours
|Considered harder than the "Hard" ones because they do not contain a longer core during SWS peak hours.
|-
|Extremely hard
|E4, E3-shortened, Uberman, Dymaxion
|<4
|>4 hours
|Not considered possible for most people.
|}
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