How many leave the jack adapter on the bike?

[RonW]

as long as you remember where you parked your bike, and not report it stolen.

[Kirknik]

Just installed the Mark T adapter yesterday. Fit was perfect and no concern about leaving it in place whatsoever. Thank you Mark.
Now still planning on your exhaust this summer.
Got a foot of snow and big wind yesterday so no rush.

[Savago]

Ordered MarkT's lift adapter last week and got it installed yesterday: easy install (like 10 minutes), works perfectly with a Blackwidow scissor jack (https://www.amazon.com/gp/product/B009W997X6/ref=oh_aui_search_detailpage?ie=UTF8&psc=1).

So far, I'm a happy costumer!

[MarkT]

I also use Black Widow scissors jacks, 2 of them, with my adapter on all Valks.  One to lift the bike and one to lift the wheels to change the tires.  The bike and Black Widows on top of my Snap-On platform lift. I use a Dewalt drill to spin the BW's up & down, while the Snap-On is electro-hydraulic.  No hand pumping!  There are other ways but this makes it all easy and quick. (eg. you can raise and lower the whole bike with a wheel on blocks or on the floor/table lift to "lift" the wheel in place.) I also have 3 std ATV/bike lifts - 2 are Sears, one was given to me - which also work but the Black Widow lifts are smaller, more convenient esp on top of a platform lift - and I don't need to lift as high now that the whole works is on the Snap-On. As I get older and with less muscle I find working smart instead of with brawn isn't just a good idea, it's mandatory!