[Lee GLS]

Will 500l last 2 people 7hours?

[darren clarke]

depends if both on full power  then no or using flow controls  poss yes,  i use less that 200 ltr when using my flow control for working 9 -3 ish, but they are all maintence cleans

[landy2]

on flow control you would easy do it

[Sunshine/Cleaning]

It depends on your preffered flow rate. I like a high rate, so 2 like me prob not.

Bit like how long is a piece of string this question, quite a few personal variables.

[Window Washers]

Will 500l last 2 people 7hours?

if thats 7 hours flat out earning you money, the answer imo is No

I have a 650l twin system and it can last a day with 2 on reg work, add loads of new cleans and add ons it runs dry