Capacity ratings by manufacturers are based on "ideal" situations. Please note, for example, both the pressure inlet and the temperature of the source water affect the production a lot (as well as the quality of the source water as well as the back pressure from the RO bladder tank, etc.). The lower the pressure inlet, and/or the lower the inlet temperature, and/or the worse the quality of the source water = the less the amount of water that is produced by your RO system.
A "typical" 24-gallon per day rated RO could take over 12 hours to fill the 2-gallon storage bladder tank. This may sound like double talk, but its an industry standard rating system. It may not seem to make sense that a 24 gpd rated RO (just an example, it could be a 30 gpd RO) that it takes as much as 12-16 hours to fill a two-gallon bladder tank.
You need to be aware of the reality of the situation. It is extremely rare that any brand of RO will deliver near its rated gallonage. If your family needs more than 5 ... more.
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