With Tom and just the two of us - a lot depends on the setting and the mood, when we are in bed and the 'moment' happens, then he gets very hard and we get it on, once he cums, and depending on how hard he cums, he will begin to soften after probably a minute. If we have time - a weekend or when we don't have things to do, and it isn't just a morning fling, we keep him semi hard between times. It is different - in different settings, if we are into sex play, then we time or pace ourselves differently, to make things last, and we are looking to extend our play time.
With Steve and during play - the whole idea is to just have fun, and to be honest I don't keep track of how long he stays hard, once I get mine, I'm not really worried, or running the stop watch. But when Steve and I - have that quiet time, then there is a lot of 'after play' and he will be semi hard after he cums, and we 'make out', and we can get him hard all of the way again and have another go. But once Steve - makes his second contribution, he will go soft fairly soon after, just like Tom. π
Sometimes with Tom and Steve - we will use some Viagra or Cialis and that changes a lot of things, and both of them will stay harder longer. Tom usually takes this - when we are with Beth Anne & Steve, and so there is a 'whole nuther' set of circumstances going on. π