Will be an analyst in M&A group, other students keep saying I will die from hours...can i get some real perspective?

I'm a senior at a non business school college, and will be starting as an analyst in the m&a group at a top bulge bracket next summer. since my college (while a target) is not really business/finance-y i only began mentioning to people this week outside of my closest friends where I'm working FT cos all the other FT recruiting stuff (for consulting, smaller banks, etc) is happening now and people asked me.

I've had two people so far tell me that I will be losing years off my life and will be working an average of 140hrs a week. Naturally this is kind of alarming. While I had interned at a top bulge this summer, I never saw 140hr work weeks but also i was an intern and not on M&A so idk. One of the students who said that I would die early worked on a bond desk this summer which was within their IB division, and so i feel like should kind of know whats going on? the other person had signed with MBB so idk if I can trust the accuracy of their judgement.

So-- my question, to anyone here who has been an analyst on a M&A team at a top BB/boutique, or knows actually what it's like: what are the hours and lifestyle truly like? I can handle an average of 85 hrs give or take, and over the summer i think i had a 95 hr week once, but if its 140hr weeks every week i think i need to reevaluate if this is the role for me as I quite enjoy living.

many thanks