Do two days of steady states this week (i.e. 2 x20, or 3x20) and a 3 hour ride this weekend. Next week cut back your time and intensity 10%, and go enjoy your race.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.