A trick I use to really get in the zone is to blast a good song on repeat. I suspect the reason this works is that the repeating song blends with itself. You do

A trick I use to really get in the zone is to blast a good song on repeat. I suspect the reason this works is that the repeating song blends with itself. You don't have the distinct transitions every 3-4 minutes, making it easy to lose track of time.