Millis interval

Gey people! quick question

If I'm using millis to time events on my project, but I would like to time things in minutes. Is there a neater way of writing it than in milliseconds? if I want my interval to be 30 mins or 40 mins the number get a bit large!

eg

long ledTimer = 600000; //timer for how long the LEDS have been on (10mins)

const unsigned long MILLIS_PER_SECOND = 1000Ul;
unsigned long ledTimer = 60UL * MILLIS_PER_SECOND;

cool thanks