Porciks sets out Friday and is confident of arriving in Riga in time for the gun at the start of the Riga Marathon at 0830 on Sunday.
In order to make the whole thing more picturesque (and probably safer), he'll be running on minor roads rather than the main Liepaja-Riga highway, and taking in notable sights along the way.
Porciks, who makes a habit of such long distance endeavors as an ultra-marathon runner and sports instructor, is hoping to cover the 241km in under 50 hours.
On March 28 he warmed up for this weekend's challenge by running from the northern town of Valmiera to Riga (107km) in just 15 hours.
The rest of the world will be able to follow Edgars' progress live via a special tracking website.