I forget if the standard VA Rates are by line, page, or hour, but yeah, the time definitely adds up.
A lot of people forget that in order to handle a game like this with Full VO, LabZero basically needs to hire more professional actors, and record more lines of dialogue for each of them, than what is typically expected from most live-action feature films. 2nd Encore alone was like, at least a TV Episode's worth of script, and Indivisible is probably going to be several times that with all of the character interactions.
When you consider the caliber of talent that will likely be behind those microphones, managing the equipment, and directing the action, the value we're getting for their time here is pretty insane.