tri changed to run-bike-run..help!!

Your tri has morphed to a duathlon ... first and foremost, enjoy not swimming.

From there remember one of my favorite lines (and best advice) from BT: "Start of slow and then taper down from there."

Judging by your logs, you are well on your way into the base training and working on building your volume. That said, you do not have a lot of volume in your base training yet ... so it is particularly important that you pace yourself below your LT.

I know that it might be a bummer to have your first race altered, but have fun!  This is the beginning of what is going to be a great season.

If I've been training for a TRIathlon instead of a DUathlon I would be disappointed, not happy even if swimming is not my strong sport. As others already said probably the run will be anywhere between 2 to 3 miles. I suggest you to do a bit of a test workout by running maybe 1/2 to 1 mile bike 5ish miles and run another 1/2 to 1 mile (plus-minus depending on your fitness level) this will give you a quick idea of what to expect and how to pace for the race... good luck and hopefully the weather allows you to race the Tri!