That's good bunny, it was my GI that told me a good 6ish yrs ago now to take fibre supplements daily and indefinitely (best advice I'd ever gotten from a GI), I started out with one (I use Prodiem which is similar to metamucil) a day and still only take one/day, I take mine just before bed, it works best for me that way since I've played around with it some to see what works best for me and one at bedtime is how I've been taking it for the most part now. No need to increase unless you find it necessary and if you do increase, do it slowly.
Wishing you lots of luck with it!