Here I have 2 calculators. The first one will tell you what numbers to put (Buffer Size & Sample Interval) in Metasys when creating a Trend.
The second one will tell you how an existing trend is setup, just put the Buffer Size & Sample Interval.

Combined Trends Calculator

Calculator #1 – Setting Up a New Trend

1 60
Seconds Minutes Hours
Hours Days Weeks
Buffer Size: 0
Sample Interval: 0 seconds

Calculator #2 – Check Trend Configuration

A trend is recorded every 0 minutes for 0 hours.