Cancer Liver

My mother found out 2 weeks ago she’s got kidney cancer, it has spread to her renal vein, liver and lungs. She has a 12 centimeter tumor on her left kidney and has to have her left kidney removed by open surgery, How long does this surgery usually take? My husband and I have agreed that I would stay and take care of her when she got out of the hospital. I would also like to know if its possibly that she will be in icu for a day or so? if anyone can help I would appreciate it.