Paula
Google
The track takes a good while but you will still be far away from it. You don't need to get to the end of the trail to see it. You can see it from the car park, from Sentinel Rock (around 30-40 minutes return trip up another track), at the end of the Forest Walk (45 minutes return) or from the very end of the track (2 hours return). The signs say it takes a little less to get there but I would say it's a bit optimistic. Especially considering you will stop for the views or rest a little and take photos. If it's sunny, bring sunscreen and if it's rainy, a raincoat since there won't be places to hide. The only advantage of doing the full track is that you will see some waterfalls on the way but they are soon after you finish the Forest Walk.
It's still a nice track but if you have been in Iceland or Switzerland, very close to glaciers, this won't be especially impressive.