Rebuilding RAID 6 takes a lot of time

We have a DL360 Gen10 with 5 SSD’s of 1.92Tb in RAID 6 configuration, running ESXi version 6.7.0-U3.
Last week we had a failed SSD in Bay 1 and replaced it with a new one.
After that we expected the system to rebuild the RAID 6, but in iLO 5 we see on the Volume a “LogicalDriveStatusReasons” which stands for “Recovering”. It is our production server and the performance is very slow, due the large amount of data and the rebuilding process. Who has the same experience and knows how long this process will take? Is this normal and expected, almost more than a week? Any suggestion of comment is more than welcome.