First convert the 2-year sentence to months: 2 years * 12 months/year = <<2*12=24>>24 months
Then add the 3 months for assault: 24 months + 3 months = <<24+3=27>>27 months
Then find how long the 1/3 extension is: 27 months / 3 = <<27/3=9>>9 months
Finally, add up the three lengths of time to find the total sentence length: 27 months + 9 months = <<27+9=36>>36 months
#### 36