The answer from the manufacturer of the shower, and the sealant compound (MX) said:
"Thank you for your email. Yes, 1 tube of adhesive should be plenty for a tray of that size. We advise to squirt the mixture in 6mm beads in strips the full length of the tray, making the strips 25mm apart. This should give you plenty of coverage once the tray is weighted down."
So, 1 tube will suffice for my 700mm x 700mm shower tray.
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