Maximum gap in (inverse) cyclotomic polynomial

Let g(f) denote the maximum of the differences (gaps) between two consecutive exponents occurring in a polynomial f. Let Φn denote the n-th cyclotomic polynomial and let Ψn denote the n-th inverse cyclotomic polynomial. In this note, we study g(Φn) and g(Ψn) where n is a product of odd primes, say p1