Yes, there was a time limit/deadline - originally it was so, so tight (something like 5 weeks) so a lot of people wrote in and they extended it to April 26th.
The main problem with the London one is frustruation surrounding the very specific questions - the cacher who set it for GAGB also set the Nottingham one, which was logged by a lot of people without visiting the location as the answers were easily found on Google/Google Maps... so the questions were made more challenging to avoid this.
Another problem I’ve seen (with the new West Mids industrial revolution one) is cachers asking what the D/T ratings are - these are physical containers, and obviously the Adventure Lab app gives zero indication of D/T...
Why can’t Labs have D/T ratings? Why can’t they have cache sizes? If you’re placing them out for months, or even permanently, they should... they’re no longer temporary, as per Mega’s!
Also, if Groundspeak had such a problem with Virtuals, why are they suddenly allowing the placement of Virtuals in this form? Don’t the same issues still exist? Worse - Virtual Labs aren’t even reviewed!