LOI Underwriting / Due Diligence

How much time/effort do you guys spend underwriting a typical acquisition, assuming there are no major issues (i.e. environmental contamination, etc.), before submitting an LOI compared to your post-DD underwriting? Let's keep this discussion to as is income producing acquisitions, not development since I'm not in that space.

I know this is a broad question and answers will depend on the deal, but I'm just trying to understand how much effort other put into uw'ing prior to getting access to all the DD materials.  

I would say that my team's underwriting used to make an offer is nearly as detailed as we can get considering the limited DD material available to us and without spending money on consultants (although we often call a contractor to get a rough estimate on any meaningful capex items we saw during the tour). Is this pretty standard? 

Idk whether my firm's approach is overkill, but it's bc my manager is super adamant about not retrading on things we could've/should've known about. I can appreciate his philosophy, especially if I were a seller/broker, but it seems like not everyone else is putting in that much effort until they have control.