RAs do not yield 15 turns of research. In BNW, the base yield of an RA (before Scientific Revolution and Porcelain Tower) is 1/6 of the lesser of your beaker production over the 30 turns of the RA and your RA partner's beaker production over the 30 turns of the RA.
Since both parties' beaker production usually will rise over the course of the 30 turns, this will amount to less than 5 turns of the laggard's current beaker production. And if your RA partner is the laggard, this will represent much less than 5 turns of your current beaker production.
Since both parties' beaker production usually will rise over the course of the 30 turns, this will amount to less than 5 turns of the laggard's current beaker production. And if your RA partner is the laggard, this will represent much less than 5 turns of your current beaker production.