Lindsey practices the quitar 50 minutes on Saturday and 30 minutes on most weekdays.

On a typical week, Lindsey practices the guitar for a total of 50 minutes on Saturday and 30 minutes on each weekday, which amounts to a weekly practice time of 30 x 5 = <<30*5=150>>150 minutes.

Therefore, Lindsey practices the guitar for a total of 50 + 150 = <<50+150=200>>200 minutes per week. Answer: \boxed{200}.