Unable to create a simple bond in Robosats

[icheyne]

Phoenix struggles to create a bond in Robosats. Their Wallet Compatibility page explains the problem:

Phoenix works very well as an order taker. Phoenix will also work well as an order maker as long as the order settings public duration + deposit duration are lower than 10 hours. Otherwise you might have problems locking the maker bond. If the total duraton of bonds/escrow invoices exceeds 450 blocks, Phoenix will not allow users to lock the bond (Cannot add htlc (...) reason=expiry too big).

I tried to create one with a "bond duration" + "public duration" < 10 hours but it still failed.