How time does mini-heal knock off of revival?

I didn't realize you could help revive with mini-heal. Having both maxed takes up alot of sp, so I was wondering if it would be more feasible to delete first aid.

You always have to run to the character to give first aid, but mini-heal can be done over a distance. And the mp cost wouldn't increase with amount of heals given to a char like it does with first aid...so wouldn't that be better?

So if I did want to make the switch, does anyone know roughly how many seconds are knocked off of the revival time when mini-heal is used? I've looked and haven't been able to find the information anywhere. 

Thanks!