About six hours for a 1,500 sq. ft. detached condo.  It was outrageous and a total waste of my time.  The buyers searched for the pickiest inspector they could find and hired him.  Wow. 

Among the many ridiculous things the inspector "discovered", were horizontal stucco cracks.  Try finding stucco without cracks.  Anyway, the guy warned of the dangers of horizontal stucco cracks and advised the buyers to hire a specialized stucco inspector.  WTF.

My neighbor at the time was a litigator for a firm specializing in construction defects and her specialty was cement.  I asked if she'd ever heard of a stucco inspector or of any particular danger of horizontal stucco cracks.  Um, NO.

As I recall, it was one of a one of my first and it was an older home and a first time homebuyer. I think it was about five hours. I never used that "recommended" inspector but the buyer became a seller a few years later and I was the listing agent. It was a very different experience that next time. Experience matters. 

We all have nightmares at some point.  I had one where we were in the inspection for 6+ hours. The owners came back since she was diabetic and needed to get her meds. Having owners back in the house made the entire ordeal worst for both the sides. As you would suspect the deal did fall apart because the buyers and inspector rip the house apart. 

I have had many where they have turned into all day affairs. 

         All day.  Retired contractor, very good, took a liking to the first time buyers, taught them everything there is to know about a house.  I met them in the morning, told them I would check back later.  It was humorous, I would call every hour or so to see how it was going.  "My wife went to get us some lunch... we are still working with the inspector".  They finished at dinner time.

Wow, I read the responses so far and cringed. I always attend inspections and stay for the entire thing, and anything over 2 hours would have messed up my schedule!

Two hours is the longest so far.

I believe 4 hours & I had certainly had enough of that property. That's long enough to call in for food & water to get delivered.

More than five hours for a two year old home 

4 hours,, inspector was sooooo slow.. he talked nonstop, and handwrote everything.. It also took him 48+ hours to get repoert back to buyer..
( no , not anyone I suggested)

Most of my home inspections have ranged from 1.5 - 2.5 hours

I do not know.

They all always take at least 3-4 hours. That's normal for most of my houses, unless it's a smaller townhome. I don't attend home inspections.

Most of mine are new construction so not a long affair.

Praful,

It depended on the size of the building and how many stories it is.  The bigger the building the more time it takes. A

Eight hours.  They brought in a regular inspector, a roof inspector, a pool inspector and an HVAC inspector.

hours went by making me joke about remodeling the place while here

I've attended one that was an all-day'er, Praful! It was a large home and we had each trade inspect (electrician, plumber, roofer, HVAC, etc.). Most of mine are under 4 hours and I attend each and every one of them. 

About 4 hours on a farm

2 hours

3.5 hours...plenty of emails and social media done in that time

I never attend so I have no answer.

4 hours.

They tend to vary with the inspector, the size and age of the house 4 hours can happen.. but typically 2 hrs ish is more my experience

5 hours,  9000 sq ft.

I had one home, very large, was five hours.

Depends on the size of the home. Up to 3 hours.

6 and half hours.  Really big house

Three and a half hours in a fourteen hundred square foot home.  The inspector was very scattered.

About 4 hours was the longest. Most take 2 1/2 to 3.

5 and half hours ...

Good to know that they spent the time to do a good job.

4.5 hours.

4,000 sqft

About 5 hours in freezing cold...

Never more than 3 hours that I can remember. If the home is large we'll simply bring in more personnel to complete the task at hand as quickly as possible.

5+ hours for an antique home inspection.... very thorough..... antiques were his specialty....

I think 4 hours is about mine too.  I usually just come at the end though.

2 days just for comprehensive...Mansion with several buildings plus more. then other day for roofs, pools, hangar. Thank goodness, Mike goes on inspections...

Eve

over 3 hrs.

This is not the kind of data I keep track of.  I do what needs to be done for as long as it takes to do it.  Generally, I block several hours for inspections depending on the size, age, and condition of the home.

I rarely am there for inspections as I know each inspector in town and I trust each of them Praful Thakkar .