Realistically, add three to four hours to a normal engine swap. I've had some experiences with the new HASport race (80 or 88A? durometer) mounts, where it takes about an hour of prying and finesse to get a B-series laid into an ED chassis, just the three mounts... I figure it's a little harder than that.

Keep in mind you have zero room for sticking interesting things in the engine compartment, once the B-series goes in. The time factor is going to come in when you try to turbo it, and making one-off bits to fit where there is no space. HX35 in a B-swapped ED is tight, in and older model it's a nightmare.