very good question, instantaneous wavefunction collapse !
what do we describe as an instant ?
in our 4-d universe the limit of a time span is the Planck time :
5.39121x10^-44sec.
smaller moments are not acceptable in our Universe, we enter after this length of time in another dimension where time is no longer measurable , which means in my opinion that the causality is no longer appliquable, which means that each (possible)moment fromthe past and the future are all together existing, it is in our opinion and from our deterministic point of view CHOAS...
The CONSCIOUSNESS we have is the only way for us to contact this FIFTH dimension, our consciousness creates lines between the points of chaos in this quintessence and so creates our analog world out of the digital chaos from the quitessence.
The COSMOS is our perception of the lines formed by our consciousness in the Chaos, this Cosmos is only one possibility of an infinite choice.
Wilhelmus
also read my essay