Yes that is normal.
It will be updating the maps for all of Europe
My 2009 XC90 takes just over 3 hours to transfer around 20 GBs of data from the DVDs to the internal hard drive.
You car map will be even bigger
The process reads and writes and verifies blocks of data at a time, and has to be especially robust considering the harsh operating environment it is running in. It could be anywhere from -20 to +40 degrees C, on a smooth road or a rough trail, in clean or polluted or dusty air.
Vehicle hard drives are very different to consumer PC hard drives.
For my car, I did it in one night with a battery charger connected, everything turned off apart from what was required, and let it sit in the garage, happily updating, for around 3 hours.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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