Grant’s album “Dust Bowl - American Roots” entered the Billboard charts on 8 July 2017, debuting on the Americana/Folk album sales chart at #24. In that same week it was also #48 on the Country album sales chart, and #25 on the Heatseeker albums chart, which goes across all genres and is a measure of sales speed.
Ultimately the album reached as high as #5 on the Americana/Folk album sales chart, #12 on the Country album sales chart, #2 on the Heatseeker Albums chart, and more (see chart below for full index of charts, top positions, and weeks on that chart).
The album charted until 11 November - 19 weeks later, having charted for all but two of those weeks, for a total of 17 weeks (four months!) on a total of 16 different Billboard charts! It was in the Top 10 of the Americana/Folk album sales chart for eleven weeks.