Time constraints have a time and place in a story and the parasite isent completly inactive. You get the 1st stage of ceromorphosis after the dream sequence incase people forget so no, you cant take as long as you want to remove the hich hiker from your head.
While of course this is beyond the scope of what Larian can do, look at Tyranny; there was the hard deadline with the Day of Swords in the opening and then a soft deadline with the player fighting all the Archons to the last man standing for the rest of the game. If everything revolved around the Day of Swords, but you found out halfway through that the edict is on hold forever but could be reinstated to instantly kill you at any time, that would be terrible from a narrative standpoint. Act 1 in BGIII is the Day of Swords, if there is no Archon battle royale between you and other True Souls in Acts 2 and 3 or the story foregoes that angle completely, the narrative falls apart.
