Which activities make you lose track of time?
Writing, of course. And related activities (to writing and the creative exercise), since the question asks for more than one activity.
I’m writing this at my lunch time, while the cooktop’s fire cooks my rice (and heats the beans). It won’t burn, I promise (eyes wide open, always). I’ll fry eggs in a moment.
I wrote something earlier, that it’ll be fun to share with you. Additionally, I take advantage of the fact that these prompts are popular and get more views than our regular posts — and they receive all the love you have to share.

Life as a jester, surrealism. Bing.com/create
Reveller Life
Aha! How life is.
There it goes at night to get some fun; here it comes in the morning, listing from side to side like a drunk.
It has the skill to walk a tightrope; on eggshells, on hot coals — yet is not afraid of the walk of shame.
It’s living itself to the fullest. Life, don’t you think you’re the coolest? Respond to it like the jester you are.
“Ehe, how you are. That’s so you to think up those lines.”
I love writing — I might start doing it more for a living.
Ah, lunch’s ready. Let’s enjoy lunch time.