Well, it's being quite long, but I was expecting it, with a 256GB SD card:
`Starting root file system check:
/dev/rdk1: file system is clean; not checking
[ 4.4143394] dk0 at ld1 (EFI) deleted
[ 4.4143394] dk0 at ld1: "EFI", 90200 blocks at 3, type: msdos
[ 4.4251179] dk1 at ld1: "netbsd-root", 500596736 blocks at 90203, type: ffs
/dev/rdld1: Partition 2 resized: 90203 500596736
Resizing / (NAME=netbsd-root)
/dev/rdk1: grow cg **************************************************** | 72%`