Is it possible to pass the value of a variable to the shutdown -t attribute using the os module?

Question

Python

def shutdown():
    hour=int(shutdownEntry_h.get())
    min=int(shutdownEntry_m.get())
    sec=int(shutdownEntry_s.get())
    if min!=""and hour!=""and sec!="":
        in_min_h=hour*60
        in_min_m=min*1
        in_min_s=sec/60
        min_sum=in_min_h+in_min_m+in_min_s
        print(min_sum)
        os.system("shutdown -s -t min_sum")

Answer 1

os.system(f"shutdown -s -t {min_sum}")