I've been watching threads about the Philips Lumea and it arrived today
Read the leaflet, followed ALL the instructions. It says half a leg should take 8 minutes, a bikini line 4 minutes and underarms 1 minute.
I guess I did spend 1 minute on my underarms. However my legs no way took me 18 mins.
What do you do? Keep the glad Flash Button pressed and glide it? Bit slower than a razor? Please advise me if you can, really want it to be effective! 
I used strength 4 for my legs and 3 for other areas as I'm a lot white there.