ROCOR liturgies aren't generally more than 2, 2.5 hours long. I have attended liturgy in Seattle (BTW, above the parish hall, behind the church, is where ST. John of Shanghai and San Francisco died), and it wasn't long or hard at all. I think you just got it on the feast day, and they probably had a molebin with krestniy hod (in Russia krestniye hodi could consist of a simple turn around the church to several hundred miles). Might even have been an akafist. Generally these kinds of services are only done on "Prestolniye Prazdniki" of the parish (parish feast).
In ROCOR, sometimes they segregate, sometimes they don't. It really isn't that big a deal, unless your in Jordanville.
Prosforas... you can usually buy them at the candle stand, usually around 50 cents, sometimes a dollar. Customarily you put in a list of departed names, and/or those sick and/or dear to you. The priest commemorates these people, blesses the prosforas and sends it back out. Russians generally cross themselves before eating it because A. it has been in the alter & blessed, B. they are praying for someone specific at that moment.
The Seattle parish, what I know of it, is very cool. The priest, his wife, and his children are very nice, and when we were there this past summer (stayed in the apartments above the parish hall), they were very welcoming and warm.
BTW, you ain't seen nothing of long services until you do a service marathon in J-ville during Passion Week. Try doing 4-5 hours for Holy Thursday Liturgy (including the Washing of the Feet rite), then 4 hours that night for the reading of the 12 gosples, then you get a break until 2PM on Friday, when you have Vinos Ploshenitse (don't know the translation), which is about 2 hours. Then, your back again at 2AM Saturday for Pogribeniya (burial) and Utrinya (matins), which lasts until about 6AM. THEN, back to church you go at 10AM for Holy Saturday liturgy, during which they read about a zillion epistles, and at the end (around 3PM) they have blessing of the bread, which they then give out to everyone. (This is an old tradition going back to when on Holy Saturday Christians spent the ENTIRE DAY in church, and therefore bread would have to be passed out). Then, at 10PM your back again for the Midnight service. You'll be there until about... probably 3:30, 4:00AM. After that, its a much easier schedule of Vespers & Matins & Liturgies, heavily interspersed with eating and drinking and general merry-making for the next 3 days. Heehee, just talking about it makes me miss it. :-D