A spacecraft starts from rest, and makes a journey to a destination $227000$ km from its starting point. It does so by accelerating at a constant rate of $15\mathrm{.}60$ m$/$s$\mathrm{²}$ up to the midpoint of the journey, and then decelerates at the same constant rate of $15\mathrm{.}60$ m$/$s$^2$ for the second half of the journey, ending at rest. How long did the entire journey take?