18 Iyar (Shavuos)

Yevamos 48b proves that the reason geirim have it so hard is because they are being punished for not converting earlier from the fact that Boaz tells Rus (Rus 2,12) "Hashem should reward you actions and your payment should be full from Hashem, the God of Israel, under whose wings you came to seek refuge". In other words since you hurried to seek refuge under His wings and convert your payment will be full (and you won't be punished and lose from you're reward for not converting immediately). The problem is that she didn't convert (Rashi 1,12) until after she had been married to Machlon for 10 years so apparently she didn't hurry to convert at all, so why does the Gemarah say that it was immediate?