Performing the following (note the range of 10,000):

`importmulti '[{"desc": "sh(wpkh([aeee1e6a/49h/1h/0h]tpubDC5bVdaveQYxGFztMShFAjU637kKjrs9FD8ne1oHR7z8tLeQJExsaxWRVeSpcCcYMdp5ecf2LQhuVaeYFZ7YEpvWTJr4nDGUJrmuvLuTSsp/1/*))", "keypool": true, "timestamp": "now", "watchonly": true, "internal": true, "range": {"end": 1000}}]' '{"rescan": false}'`

takes many minutes. @achow101 reports a similar import taking 6 minutes on his machine.
if (*block_height % 100 == 0 && progress_end - progress_begin > 0.0) {
                ShowProgress(strprintf("%s " + _("Rescanning..."), GetDisplayName()), std::max(1, std::min(99, (int)((progress_current - progress_begin) / (progress_end - progress_begin) * 100))));
            }
            if (GetTime() >= nNow + 60) {
                nNow = GetTime();
                WalletLogPrintf("Still rescanning. At block %d. Progress=%f\n", *block_height, progress_current);
            }
            CBlock block;
            if (chain().findBlock(block_hash, &block) && !block.IsNull()) {
                auto locked_chain = chain().lock();
                LOCK(cs_wallet);
                if (!locked_chain->getBlockHeight(block_hash)) {
                    
                    
                    
                    
                    result.last_failed_block = block_hash;
                    result.status = ScanResult::FAILURE;
                    break;
                }
                for (size_t posInBlock = 0; posInBlock < block.vtx.size(); ++posInBlock) {
                    SyncTransaction(block.vtx[posInBlock], block_hash, posInBlock, fUpdate);
                }
                
                result.last_scanned_block = block_hash;
                result.last_scanned_height = *block_height;
            } else {
                
                result.last_failed_block = block_hash;
                result.status = ScanResult::FAILURE;