Check the fine print in your Geico policy. It's my understanding the Geico MC policies limit the rider to 500 miles in a 24 hour period. There are certain Long distance Rallies that won't let you run their event if your insured by Geico. This may or may not be a concern to you.
Since I am currently shopping for insurance on the bike I pick up tomorrow...I emailed GEICO last night about the mileage question. I received the following reply:
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We do not limit our riders on the miles they operate their bikes per day.
There are no limitations.
Sincerely,
Kim Rushing
GEICO® Motorcycle Representative
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So far, they are the cheapest I have found, but still waiting on a couple more quotes to come in.