It's 3700 miles on the bike. The last book is particularly challenging because, contrary to what the Internet says, they fully expected to be done at 10 books (which took them 32 years). But then they got bored and decided to write the 11th book in the series, also the 150,001st book on Napoleon (by their own reckoning). Which includes like half the shit they had in the 10th book. Audible tells me I'm at 1 month, 10 days, 2 hours and 37 minutes. But I'm pretty sure that's per install not overall because it makes you re-earn all your badges every time you do a new install. My library has 240-some titles in it. Assume 40 of those are unread and assume the rest average 20 hours (which is probably conservative) and that's five and a half months of listening. That might be since switching to Android in 2015.