六時半に起こしてください。

six

about an hour; short time; half past (the hour)

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to raise; to raise up; to set up; to pick up; to wake; to wake up; to waken; to awaken; to cause; to bring about; to lead to; to trigger; to give rise to; to create; to generate (e.g. heat, electricity); to produce; to start; to begin; to launch; to establish; to found; to set up; to open; to plough; to plow; to till; to fall ill with; to transcribe; to write down (what is spoken); to turn over (a card)

to give; to confer; to bestow; to kindly do for one; to oblige; to favour; to favor