Yep, the longer boil is a safer play. It is unlikely that you will get problems with a 60 minute boil for ales but under certain conditions you can. Funny water chemistry or poor quality grain can give problems with a 60 minute boil that a 90 minute boil often fixes.
A few years back we had a poorer barley crop so a 60 minute boil would give clarity/haze problems that were fixed by a 90 minute boil. Anyone with a weak burner would probably be better off with a 90 minute boil as well.
You mentioned jake about the longer boil meaning you need less grain. This isn't quite right. The few extra litres you need to cover the extra 30 minutes evaporation only increase the into kettle efficiency of the brew by a percent or two. So, you basically have to use pretty much the same amount of grain for a 60 minute boil as you do for a 90 minute boil.
I'll attach a more advanced pdf on boiling though it doesn't say much about time.
PP
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