A little while ago, Monte Cook made some excellent points about why 1 minute/level spells are bad. However, there is some cases where I consider them far superior to the suggested 1 round/level variants - and this is especially for the case of a caster of 1st through 4th level.
If one considers the revised Bull's Strength spell, at 3rd level the poor caster only gets 2 rounds of use out of it if they cast it upon themselves - hardly worthwhile, really. If one considers a typical D&D combat to last from 3-8 rounds, that's a fairly minor effect.
The 1 minute/level spells will last all of that combat. This is good.
It is quite possible that they would have been better to be set as a duration of "1 minute" or "2 minutes", so that the possibility of running to the next combat didn't occur.
However, it does allow them to be used for some non-combat uses that may take longer than 1 minute. Enhancing the searching of a room, for instance. (With a duration of a mere 1 minute, you cannot "Take 20", for instance).
Conversely, 10 minutes/level is a significant amount of time, and can be basically the entire adventure for many scenarios - especially with an Extend Spell feat and a 10th level wizard. (3 hours? We should be able to finish it by then!
)
The new durations of the buff spells basically say "1 encounter", and take into account the possibility that the encounter would be just a single combat - some other forms of challenge are possible.
Well - any problems with my reasoning?
Cheers!
If one considers the revised Bull's Strength spell, at 3rd level the poor caster only gets 2 rounds of use out of it if they cast it upon themselves - hardly worthwhile, really. If one considers a typical D&D combat to last from 3-8 rounds, that's a fairly minor effect.
The 1 minute/level spells will last all of that combat. This is good.
It is quite possible that they would have been better to be set as a duration of "1 minute" or "2 minutes", so that the possibility of running to the next combat didn't occur.
However, it does allow them to be used for some non-combat uses that may take longer than 1 minute. Enhancing the searching of a room, for instance. (With a duration of a mere 1 minute, you cannot "Take 20", for instance).
Conversely, 10 minutes/level is a significant amount of time, and can be basically the entire adventure for many scenarios - especially with an Extend Spell feat and a 10th level wizard. (3 hours? We should be able to finish it by then!

The new durations of the buff spells basically say "1 encounter", and take into account the possibility that the encounter would be just a single combat - some other forms of challenge are possible.
Well - any problems with my reasoning?

Cheers!