Quicker than I thought. I should try something like this soon!

Not long. 6 poodle engines produce 1,500 kN of thrust. When it started the burn above, it massed ~295,000 kg. F=ma, so its acceleration was a little over 5 m/s^2, or better than half a g. This burn needed to lose 1,044 m/s, so it took somewhere between 3 to 4 minutes.

How long do the burns take to complete? Man, only poodle engines...