Extremely long dryer vent line, non efficient dryer
Your dryer manufacturer will have specifications for maximum vent line length, including max distances depending on type and size of vent and how many turns.

It is very important that you:
- use rigid rather than flexible line whenever possible
- minimize elbows and turns
- make it as short of a run as you can (never exceed manufacturer's max) 

It is not unusual to have a 30' length, but it should be rigid pipe. Check out this chart.