Heidi and network times

when heidi tells me this for a query .....

• Affected rows: 0 Found rows: 2,821 Warnings: 0 Duration for 1 query: 0.250 sec. (+ 5.609 sec. network) */

what can i infer from the high network time?

is it really network? none of the columns are large binary or text. and sometimes, after the same query is tried several times, the same result set gives a much lower network time. So i'm wondering if there's disk access included in that time?

thanks