The amount of bonus experience given is only matched up to 1 pulse core, i.e. if the activity performed gives more experience than the charges on the current pulse core, a new pulse core will not be used to fill in the remaining bonus experience. Bonus experience does not stack with pulse cores and will remain unused as long as a pulse core is wielded. This boost shows up in the boosted stats section of the EoC interface as "Pulse Essence - x% XP Boost" where x is the current percentage boost. The boost lasts for 10 minutes, but subsequent explosions reset the 10 minute timer.