Scan not completing

Hello, I hope you can help. The scan will not complete, it has done in the past but not recently. I have tried, suggestions from documentation. I don’t see any messages regarding memory.
Thank you very much, I look forward to hearing from you. I have added information which could assist.

I had this message under connectivity on the Diagnostics page:

wp_remote_post() test back to this server failed! Response was: 403 Forbidden<br /> This additional info may help you diagnose the issue. The response headers we received were:<br /> date => Fri, 18 Aug 2017 11:37:22 GMT<br /> content-type => text/html; charset=UTF-8<br /> set-cookie => __cfduid=dc1211bf9cb26ba10e0833a1529815ef71503056242; expires=Sat, 18-Aug-18 11:37:22 GMT; path=/; domain=.allaboutstyle.co.uk; HttpOnly<br /> cache-control => max-age=2<br /> expires => Fri, 18 Aug 2017 11:37:24 GMT<br /> x-frame-options => SAMEORIGIN<br /> server => cloudflare-nginx<br /> cf-ray => 390494ab6cd634d0-LHR<br /> content-encoding => gzip<br />

The information from the activity log is below.

[Aug 18 11:26:39:1503055599.246947:2:error] Scan terminated with error: The scan time limit of 20 seconds has been exceeded and the scan will be terminated. This limit can be customized on the options page. Get More Information
[Aug 18 11:26:39:1503055599.245876:2:info] Wordfence used 1.5 MB of memory for scan. Server peak memory usage was: 43.25 MB
[Aug 18 11:26:38:1503055598.504945:4:info] Calling Wordfence API v2.23:https://noc1.wordfence.com/v2.23/?v=4.8.1&s=https%3A%2F%2Fwww.allaboutstyle.co.uk&k=dac14af38e855fe7c720fc3519410eb40030e88187f370dedfece21bc06c715863d0bd662e26bd677bf71a5c23fedb5be0f702d0eb487f563729a5ea2b3a879d36f59c1f4df73b8e6d3cb73dea3f29db&openssl=268443679&phpv=5.6.22&betaFeed=0&cacheType=disabled&action=record_scan_metrics
[Aug 18 11:26:38:1503055598.320874:10:info] SUM_FINAL:Scan interrupted. You have 1 new issue to fix. See below.
[Aug 18 11:26:38:1503055598.319589:1:info] Scan interrupted. Scanned 2351 files, 7 plugins, 3 themes, 18 pages, 0 comments and 49563 records in 21 seconds.
[Aug 18 11:26:38:1503055598.318226:1:info] ——————-
[Aug 18 11:26:23:1503055583.880138:10:info] SUM_START:Checking for the most secure way to get IPs
[Aug 18 11:26:21:1503055581.864072:10:info] SUM_PAIDONLY:Checking if your site is on a domain blacklist is for paid members only
[Aug 18 11:26:19:1503055579.857797:10:info] SUM_PAIDONLY:Checking if your IP is generating spam is for paid members only
[Aug 18 11:26:17:1503055577.848812:10:info] SUM_PAIDONLY:Check if your site is being Spamvertized is for paid members only
[Aug 18 11:26:17:1503055577.830231:4:info] getMaxExecutionTime() returning half ini value: 300
[Aug 18 11:26:17:1503055577.829195:4:info] Got max_execution_time value from ini: 600
[Aug 18 11:26:17:1503055577.828050:4:info] Got value from wf config maxExecutionTime:
[Aug 18 11:26:17:1503055577.197883:4:info] Calling Wordfence API v2.23:https://noc1.wordfence.com/v2.23/?v=4.8.1&s=https%3A%2F%2Fwww.allaboutstyle.co.uk&k=dac14af38e855fe7c720fc3519410eb40030e88187f370dedfece21bc06c715863d0bd662e26bd677bf71a5c23fedb5be0f702d0eb487f563729a5ea2b3a879d36f59c1f4df73b8e6d3cb73dea3f29db&openssl=268443679&phpv=5.6.22&betaFeed=0&cacheType=disabled&action=log_scan
[Aug 18 11:26:17:1503055577.194639:1:info] Contacting Wordfence to initiate scan

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