As long as you're okay with the chosen ikon glowing or otherwise humming with power, it seems to be an intended interaction that you can have your ikon empowered whenever you want and for as long as you want, provided you don't need to hide your power for any reason.
Depending on context it might be somewhat like having a weapon drawn--wandering the dungeon it's no problem, but in a tense diplomatic showdown, it might get awkward if somebody sees your shoes or belt radiating divine power. In these cases there may be cause to keep the spark away, but otherwise most of the time it's only natural to keep it around.