SJ789 I personally agree with shorter timers, but I've found that some of the newer players or players who havent played games like counter-strike really need that extra time to get to their places, walk to the wrong place, and then correct themselves, and also rebuy multiple times exploring their options / game plan. Whether we want to account for players like that is a whole other question that I won't get into, I just thought I'd mention that I've heard multiple people mention that the long start timer were nice for them.
Definetly shorten the one during half-time though, it makes no sense.