Please help me solve the following questions. Thanks

Assume the SPI clock is 12 MHz. In the Nokia5110.c software driver, there is an array that contains one 84 by 48 LCD image (48*84 = 4,032)

#define SCREENW 84

#define SCREENH 48

uint8_t Screen[SCREENW*SCREENH/8];

The function Nokia5110_DisplayBuffer sends this entire buffer to the LCD. Approximately how long does this function take to execute? (Describe your calculation in your answer)