At this time, 60 minutes is the longest duration available in Custom Mode. When your session ends, you can restart at your previous settings using Single Press:
Press anywhere on the light bar to wake up your Embr Wave. Then click once on the warming or cooling side of the light bar (or tap on the light bar in the app!) to start a session using your last used settings. For example, if you've adjusted your cooling down to -10 degrees, you can get right back to -10 the next time you use your Embr Wave by clicking once on the blue side of the light bar. No need to readjust to get back to your favorite temperature level!