Yeah unfortunately if you dont have access to ra-den it does take a bit.
Also without doing the valor cheat, its still possible to do it in 5 weeks, just highly improbable
week 1 - Sigils
week 2 + 3 = 2000 valor
week 4 = finish valor w/o stepping into tot. get 20 secrets off 21 bosses
week 5 = get 12 runestones off of 15 bosses
But in all likelihood, this is just a bit too much of luck and I can't buy it. I could realistically see 6 weeks. 7 weeks for sure. but 5 is like so incredibly lucky that... I just dunno