Hola, Xavier, and welcome to planDisney! I was hoping you might be running 
runDisney Springtime Surprise with me next month, but, I know, no one turns down a royal invitation to dine with Elsa and Anna at 
Akershus Royal Banquet Hall.
runDisney events are very early in the morning and the runners should be out of the parks before you head to 
EPCOT. That said, I am a person who is fine arriving at the airport as they are calling for boarding, but I hate to keep royals waiting and I give myself plenty of time to get to my dining location. The park hours calendar for your trip is not yet available, but the current park hours have EPCOT opening at 9 am and 
Early Entry Hours for resort guests at 8:30 am. With an 8:30 am breakfast reservation, you will be arriving during theme park "rush hour." 
If you are staying at a 
Disney Resorts Collection hotel on 
Disney's BoardWalk, you can walk to the EPCOT International Gateway entrance. And if your resort connects to the 
Disney Skyliner, you can swing like Tarzan to the same entrance. I would plan for 20 to 30 minutes from your resort to arrive at EPCOT close to 8 am so you have time to go through security, scan your ticket for entry, and walk to Norway.  
If your Disney resort uses 
bus transportation, you may have additional traffic with the extra buses taking runners and spectators back to their resorts after the race. You can check the 
My Disney Experience App under "Hotel Reservation" to see when the bus to EPCOT will leave your resort. I would allow an hour or maybe even an hour and fifteen minutes to be safe. 
Given your reservation may be before the park opens, there are usually Cast Members with a sign for Guests with a restaurant reservation. Look for them - or ask a Cast Member upon arrival - so you can enter the park in time for your dining reservation. The park may not open until 8:30, and it will have a line of people hoping to be among the first in the park to run to their favorite attractions. The Cast Members are important to make sure you can enter the park early to make it to Akershus by 8:30 am.
It's a beautiful time to be at 
Walt Disney World Resort with 
EPCOT International Flower & Garden Festival. I was there last week and tried some delicious treats with the 
Garden Graze menu. The Seasonal Fruit Parfait with Sweet Chili Sauce and Mango DOLE Whip® is not to be missed!
I hope you have a magical vacation! Please come back to 
planDisney with any other questions. 
See 'Ya Real Soon!
Jana