lindsay practices the guitar 50 minutes on saturday and 30 minutes on the most weekdays

Assuming there are 5 weekdays in a week, Lindsay practices the guitar for a total of 50 minutes on Saturday, and 30 minutes on each weekday.

Thus, Lindsay practices on weekdays for a total of 30 minutes/day x 5 days/week = <<30*5=150>>150 minutes.
Therefore, Lindsay practices the guitar for a total of 150 minutes on weekdays + 50 minutes on Saturday = <<150+50=200>>200 minutes per week.