I agree it shouldn't, the recover and rebalance when I swapped in the 3TB drives, one at a time, was done in less than 32 hours. More like 28, and the system is much quicker for everything now with matched drives, except scrub which got even more pitiful. As I type it is at 15.4% after 5 and half days! Pretty much makes the tool useless. Especially when yo addin the impact on the overall performance of the system.
