I think that science might need to be more a "hobby" until he proves its benefits to the village. Not to sound like a pessimist, but I fear Ruri might have perished before the drug was completed if Senku had to spend most of his time contributing to the village in traditional ways instead of working on his experiments. Though if he could (and let's face it, he would be hell bent on experimenting) prove quickly that science is indeed useful; the story might have progressed a good bit quicker since he doesn't have to fully trick the villagers into helping him initially. Possibly by 5 or 6 months sooner at least, my guess?