" is making a general statement about the time that you usually get up, and you can't say "I usually get up ten minutes earlier than I usually get up". If you add a qualifier to narrow its applicability, it becomes meaningful: "Yesterday I got up ten minutes earlier than usual" "This morning I got up ten minutes earlier than usual" (still past tense) "Tomorrow morning I will get up ten minutes earlier than usual" "I arrive 10 minutes earlier than you do " That sentence is fine. Again it's making a general statement, because there is no qualifier that narrows its applicability.
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