I recently used Toro's design service for a new backyard. This is my second sprinkler system and much larger than the last. It is a seven zone system for the backyard. One of the zone is a drip system for the flower beds. The total length of 1/2" drip line is 855 feet. But, the design called for all of that to come off of one riser. Is that okay? It seems like it should be split up, but I don't know.
Depending upon the amount of emitters installed on the drip line and your pressure, I would say that would be OK. Since you sent your pressure information to Toro when they designed it, I would assume they designed it properly. It is not unheard of though to put it all on one zone.
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