First find the time Mary spent downloading the Windows version: 10 minutes * 3 = <<10*3=30>>30 minutes
Then find the total time the audio glitches took: 4 minutes/glitch * 2 glitches = <<4*2=8>>8 minutes
Then add the video glitch time to find the total glitch time: 8 minutes + 6 minutes = <<8+6=14>>14 minutes
Then double that time to find the total glitch-free time: 14 minutes * 2 = <<14*2=28>>28 minutes
Then add the talking time to the download time to find the total time: 30 minutes + 10 minutes + 14 minutes + 28 minutes = <<30+10+14+28=82>>82 minutes
#### 82