It's still a valuable alternative even if it is only 1 minute. Average Paladin spell points is probably in the 200-230 range (guess, my Pally has 370 I believe).
If you can cast Resists, then you will cast say 3 of them every ~7+ minutes which means you will cast 6 within the timeframe for your spell points. That means you will have used 90 pts IIRC leaving 110-140 for DF or you will have 11 to 14 minutes of +2/+2. That's more than enough to get you through to most shrines, so essentially you have +2/+2 "all the time".