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You do realize that SLEEP mode eventually results in OFF mode?
No offense, but sleep mode consumes more power than "off". In sleep mode the contents of the RAM are preserved, RAM must be powered and refreshed continuously. The off mode is a deeper sleep mode without dynamic refresh of the RAM or the unit could start up exactly where you left off, as an option, instead of booting. In OFF mode it is likely only looking for input from the multimode power switch and maintaining time/date functions and performing whatever minimal "housekeeping" that must be maintained.
However, if you allow the reader to repeatedly sleep then shut off during use and reboot a lot, especially with a lot of ebooks loaded, it may in fact draw more power because it has to scan the titles stored and process them each time you boot. You'd be better off waking it from sleep before it gets to OFF mode as it would only cost a page refresh, rather than costing a reboot over the SLEEP mode cost.
You really have to set the Sleep and Power settings to match your usage patterns to extract the maximum run time. Honestly, if you end up allowing the unit to go to OFF mode a lot your only recourse would be to change your own usage patterns if you want longer battery life as Kobo apparently feels that going longer than 60 minutes in sleep should force the OFF mode as there is no way to completely disable it. It's quite likely that the average reader settles in for a longer continuous period of reading than a series of short periods of reading interrupted by longer periods of OFF time. You also must run the battery down occasionally to calibrate the power gauge if you're getting less than expected runtimes.
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