On the last day, we'll be chasing 17 wickets. Very gettable. The only problem is the likelihood that NZ will have to bat again between the two Bangladesh innings, taking up extra time and requiring another calculation of when to declare. However, Karl has just pointed out to me some interesting aspects to the follow-on law (law 13).
Apparently the follow-on target depends on the length of the match, not just the grade.
Length TargetThe interesting aspect is that the length of the match is determined from when the first ball is bowled. So this will be a two-day match, with a follow-on target of 162, which is not all that low a total for Bangladesh. That dramatically decreases the likelihood of NZ batting again after the first Bangladeshi innings.
5 days within 200 runs of opponent's total
3 or 4 days 150
2 days 100
1 day 75