The ZeroPunct review is up, and he was fairly scathing... one of his main gripes are the mission timers, which seems to annoy a lot of people. It's probably the main reason why I don't plan on getting this. Hate being rushed.
This is ridiculous not once in any mission did I ever feel rushed to get to the objective, the timers are long enough that if you move at even a normal pace you will make it with a few turns left. In fact most missions I would get to the objective and turtle around it for a few turns to make sure nothing unexpected happens when I trigger it or to organise my squad so that once I complete the objective I can evac. out that same turn.
I think on average I came across maybe 3 sets of 3 enemies on the route to the objective (when you get the building that tells you how many enemies there are on each level it becomes even more obvious what you are likely to come up against), the 3rd set being directly around the point and the turn timer is something around 7 turns. Considering you start in concealment most of the time the 1st set should only take 1 turn to kill and you know where the objective is on the map so moving directly towards it shouldn't take too long either, its distance from the starting point can vary but I wouldn't say its much further than 4 full movement turns away, less if you hack from distance.
With numerous abilities that allow you to move front line units into safety (Ranger: Conceal or Run+Gun, Unplacable, Untouchable. Specialist: Threat assment or Covering Fire, Ever vigilant, Scanning protocol) and 2 abilities to control enemy units to use them as front runners and fodder to the enemy with Dominate and Haywire protocol. There is no need to crawl as should you uncover some enemies in a bad position you have many ways of moving that single character to relative safety, assuming you aren't using a Grenadier or Sharpshooter run at the front of your pack to uncover enemies.
It is literally designed as mentioned above so you cant crawl along a map and overwatch every step of the way. I cant remember all the objectives of timed missions but most of them was to just hack a console and with a specialist you can do it from miles away anyway meaning you don't even need to get near the objective.