Skills Without Duration Icons
I feel that the skills you mention should not have any visible duration cues. Personally, I feel players should be expected to learn and understand skills of their opponent in those cases. Particularly when those skills do not specifically add an effect to a specific player, be it the use of the skill, or those effected.
I disagree with dancing (and thus agree with OP). The skill of playing a game should not be in memorising tons of arbitrary facts and numbers, but in knowing how understand an opponents tactic, and work out how to beat it with what you have available and then to execute that plan as quickly and effectively as possible.
The best games out there are ones which are complex but where all the complexity is available to the players. Having hiding durations and invisable rules is the quickest way to make a game go from challenging but engaging to confusing and frustrating.
Gunnar’s Hold