Don't do this! I did this at a previous company, and I got laid off at a point that I didn't even remember why I sat before my laptop and what I was supposed to do after just 15 minutes.
Talk to your manager and lead. If it doesn't help, talk to your skip manager. Keep escalating it, to Sr. Manager, and if needed, since it's a startup, you can even involve the CEO. If it didn't resolve after two escalations, start looking for other opportunities.
Btw, when did you join this startup? Are all teams like this, or is it only yours? Did you try talking with your other teammates?